Twisted grass, by the sound of it (3)
I believe the answer is:
wry
'twisted' is the definition.
(I've seen this before)
'grass by the sound of it' is the wordplay.
'grass' becomes 'rye' (I've seen this before).
'by the sound of it' indicates a 'sounds like' (homophone) clue.
'rye' is a homophone of 'WRY'.
(Other definitions for wry that I've seen before include "'Dry, ironic (3)'" , "Of facial expression, mocking or twisted" , "Mockingly humorous" , "Of humour, humorous and mocking" , "Twisted; sardonic" .)