Gentle little thing (6)

I believe the answer is:
maggot
'gentle little thing' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
This is the entire clue.
Can you help me to learn more?
(Other definitions for maggot that I've seen before include "immature flyer" , "Larva of housefly or bluebottle" , "one that may be in decay" , "Larva feeding on decaying matter" , "Blowfly larva" .)
