Twisted-sounding grass (3)
I believe the answer is:
rye
'grass' is the definition.
(I know that rye is a type of cereal)
'twisted-sounding' is the wordplay.
'twisted' becomes 'wry' (I've seen this before).
'sounding' indicates a 'sounds like' (homophone) clue.
'wry' sounds like 'RYE'.
(Other definitions for rye that I've seen before include "Cereal grass - Sussex Cinque Port" , "place in East Sussex" , "New York bread" , "Cereal plant; whisky" , "Type of grass" .)