Terrible monster clutching fruit (5)
I believe the answer is:
lemon
'fruit' is the definition.
(I know that lemon is a fruit)
'terrible monster clutching' is the wordplay.
'clutching' says the answer is hidden in the clue.
'LEMON' is hidden within 'terrible monster'.
(Other definitions for lemon that I've seen before include "Fruit-tree" , "Fruit squeezed on Pancake Day?" , "something defective" , "Shade of yellow - fruit" , "very different from peach?" .)