Not all red lentils, say, cause aversion (7)
I believe the answer is:
repulse
'cause aversion' is the definition.
(I've seen this before)
'not all red lentils say' is the wordplay.
'not all' means to remove the last letter (not quite all of it).
'lentils say' becomes 'pulse' (lentils are pulses).
'red' with its final letter taken away is 're'.
're'+'pulse'='REPULSE'
(Other definitions for repulse that I've seen before include "Ward off" , "Drive back or reject" , "Check" , "Rudely reject" , "Beat back" .)