Crossword Genius

Grin (5)

Ross

I think it could be either:

smirk

smile

'grin' is the definition.
(I know that grin is a more specific form of smile)

This is all the clue.

(Other definitions for smile that I've seen before include "Show pleasure in slime" , "Look happy" , "Happy facial expression" , "express pleasure" , "Grin" .)

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