Crossword Genius

Grin (5)

Ross

I think it could be either:

smirk

smile

'grin' is the definition.
(smirk is a kind of grin)

This is all the clue.

(Other definitions for smirk that I've seen before include "Simper" , "Smile scornfully" , "Appear smug" , "Complacent smile" , "Smug smile" .)

I've seen this clue in The Mirror, the USA Today, The Star Tribune, the Penny Press, the LA Times, the Evening Standard and the Universal.
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