Crossword Genius

__-in-cheek (insincere) (6)

Ross

I believe the answer is:

tongue

(Other definitions for tongue that I've seen before include "Part of body - language!" , "Perhaps the Gaelic" , "One gut in the mouth" , "spit" , "cold meat?" .)

I've seen this clue in the Newsday and the Newsday.com.
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