Enigmatic Variations 1480
Spoiler Alert by Kcit
Correct letters in misprints spell DOG IN THE MANGER; added to letters unindicated in wordplay, they produce the phrase KILLJOY WAS HERE.
Sadly Kcit has chosen to not provide a setter’s blog for this site, choosing instead to post one on his own site (see Links for a link to Phi Crosswords).
A full review of this puzzle can be seen over on fifteensquared.