Crossword Genius

Possibly wry expression of chagrin? (4)

Ross

I believe the answer is:

grin

I'm a little stuck... Click here to teach me more about this clue!

'possibly wry expression' is the definition.
'grin' can be an answer for 'expression' (I have seen 'Facial expression ' mean 'grin' so perhaps 'expression' could also mean 'grin'). I am unsure of the 'possibly wry' bit.

'chagrin?' is the wordplay.
'GRIN' is hidden within the letters.
But, I am not sure how this is indicated.

'of' is the link.

Can you help me to learn more?

(Other definitions for grin that I've seen before include "Happy expression" , "show ivories happily with it" , "Smile while pulling back the lips" , "Accept with good grace - . . . . and bear it" , "Smile - all that could be seen of the vanishing Cheshire Cat" .)

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