Crossword Genius

Cut grass back with an expression of defiance (3)

Ross

I believe the answer is:

yah

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

'an expression of defiance' is the definition.
I can't judge whether this defines the answer.

'cut grass back' is the wordplay.
'cut grass' becomes 'hay' (I've seen this in another clue).
'back' says the letters should be written backwards.
'hay' backwards is 'YAH'.

'with' is the link.

Can you help me to learn more?

(Other definitions for yah that I've seen before include "Yes" , "Informal agreement" , "toff" , "Defiant expression" , "Expression of derision" .)

I've seen this clue in The Globe and Mail.
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