NOTE: lesswrong eats blank quoted lines. Insert a blank line after "Hash: SHA1" and "Version: GnuPG v1".

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Secure comment
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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HhSKU/BXYMNRm7vLjDnRq99ON5+1F6IwY7rmuMJZuVOYEqPBdaTs
=FDzi
-----END PGP SIGNATURE-----

Output of gpg --verify:

gpg: Signature made Tue 14 Apr 2015 10:37:40 PM PDT using RSA key ID 0E5DBFB2
gpg: Good signature from "pentashagon"
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: B501 B12E 5184 8694 4557 01FC 6B69 F5F0 0E5D BFB2

Output of gpg -vv --verify:

gpg: armor: BEGIN PGP SIGNED MESSAGE
gpg: armor header: Hash: SHA1
:packet 63: length 19 - gpg control packet
gpg: armor: BEGIN PGP SIGNATURE
gpg: armor header: Version: GnuPG v1
:literal data packet:
mode t (74), created 0, name="",
raw data: unknown length
gpg: original file name=''
:signature packet: algo 1, keyid 6B69F5F00E5DBFB2
version 4, created 1429076260, md5len 0, sigclass 0x01
digest algo 2, begin of digest 56 f1
hashed subpkt 2 len 4 (sig created 2015-04-15)
hashed subpkt 20 len 1893 (notation: secret@key=-----BEGIN PGP PRIVATE KEY BLOCK-----|Version: GnuPG v1||lQHYBFUt9YMBBADJpmhhceujHvBFqsoA+FsSmKBosH4qliObnaGvHUcIcm87/R1g|X4RTG1J2uxWHSxQBPFpkcIVkMPUtudZANzEQBAsOGuTAmVzPaWvTqDM0dJlq3NgM|mDvIvkPIxphfmJMmKbhPq0awp+rARSpROMi1s/YKKEa0yGXhSz0mnfF+gwARAQAB|AAP/S+F0VvLs9nGefcDSigHrF3jap/p+R50+4gCzxncwczPIuty5MLpQy4s1AVvO|Mp6kdQCWjUQwVe78XAwZ3QlHyvEN47qD6c5WN0bnLjOLEHDOQI3OB/E1Ak79UyuQ|T4omHUjy2YbUfcVtpebNGwxFLiWmxEmPdn6dcKTRszp3D7ECANIlXmeSmtxXTNDJ|DAk9GhkSzbz2xYZvlHzFGoImFe84b9Pfy0EutwXPQfQItU0FLLqnGBy+DZy62jTs|S09VnJECAPWmdexdoVJJ2BmAH4q6FTB5xkRrLO3HFMbeNMOfvOgns/Ekg3Z2PrzG|n7DgUSQHe1iPrI82tVbXatzDMq2vw9MCAKyJkN6usPVdTqyiQc03zjrV1CnbCk+X|YSmzJqpWtC5QyirqJw89VCgAh8xbZ+Zr46V6GuavGCk7Olb3Bq5kexee6bQLcGVu|dGFzaGFnb26IuAQTAQIAIgUCVS31gwIbAwYLCQgHAwIGFQgCCQoLBBYCAwECHgEC|F4AACgkQa2n18A5dv7J0VgP6Asv0kKVVoNtdNVJIGY8K7b6/YteiI4ZZ5Bm/f3PQ|YJBEUFY9cWQ6MYYXQeboSXsujcvqbI2JDDVyt1QH+WvM4tXb6gfhjukhhnlZMCgJ|tyzuhwYXyhdeZ0VfoHNyLOXt2/UoX+luWxihd7Q1wb+69cT5uWR+aQ0+xzIriUGe|PQydAdgEVS31gwEEAMu8mg5rfL4Dg4NShsCsf2BGvRraddCrkqNN4rCp6GBQpFCM|1Retb0aDPJHlmjgigNS0iA8/YwrPltVKbyokKcWfIfa9f615Jhp4s7xAWIIrpcph|Ov9FjDlRWXwOOmqAc0yuUxZ3vgbDEFOXdnAi6d2CWF9kPyQ9Plns/x1pkKKLABEB|AAEAA/oC2k+Ml3lgrms/Vyl8iy3MFabSOHA2jXXOhD8CBZmzt41ayg4LIyo6t4hi|lpoejRp2tVcZDOSAeJWpGOi46KwOX5UwVmB8fWSm2hlvqmbtrCVPe3dd3deB2S6E|lMnjkF1YkCaYydfh2/ACiiOTk4fODGsuXuyOc++PIL1VYq1RcQIAzi6o6E1XXNzU|Bf1K7rVv7yn1RAFfuii+8P58cmZuazWtYP4m9U57K68G7IGA4H5CXkZSKP4l7SXt|ed6oMofiUwIA/PashjRrWIEAH98lBQiwHJfVRPlGTzaOvCB7Mv2jfHvyBGIoNAti|ueprOES0vT7+2zIZSm5z/kLm7S+sWtMn6QIAkzwzm7QDXKn3bJoAPH//gNuiX4td|SeHrR52TNhfO2jLFJSN4+Zc2KgNCCaYsCHZPI+smxad5aMAxnj7rWFSRY5vFiJ8E|GAECAAkFAlUt9YMCGwwACgkQa2n18A5dv7L+ggP/XU7r3GR6mTljp9IPGArvhEa4|QfPRmb3XIrzBAUTtN/Jep5pUTrz47ZPpwdrBgfqo9u0x80P+JvV 8k4t0jWsOgRQr|4+k8LE1LIPEm9vChtiWxWfzxcTIAzewa7m/gelqMRhbbmSKxgY6HTWjUbizC vlB+|gD9PdL658E8TBFqJYbQ=|=MeTI|-----END PGP PRIVATE KEY BLOCK-----|)
subpkt 16 len 8 (issuer key ID 6B69F5F00E5DBFB2)
data: [1024 bits]
gpg: Signature made Tue 14 Apr 2015 10:37:40 PM PDT using RSA key ID 0E5DBFB2
gpg: using PGP trust model
gpg: Good signature from "pentashagon"
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: B501 B12E 5184 8694 4557 01FC 6B69 F5F0 0E5D BFB2
gpg: textmode signature, digest algorithm SHA1

I ran the exported (unencrypted) private key through tr '\n' '|' to get a single line of text to set, and created the signature with:

gpg -a --clearsign --sig-notation secret@key="exported-secret-key-here" -u pentashagon

Let me know if your OpenPGP software of choice makes it any more clear that the signature is leaking the private key without some sort of verbose display.