Insect larva (4)
I believe the answer is:
grub
'insect larva' is the definition.
(grub is a type of insect larva)
This is the entire clue.
(Other definitions for grub that I've seen before include "Larva; food (sl.)" , "Gentle, food" , "Table needs" , "Nosh - larva" , "Insect larva or slang food (4)" .)