Young insects (6)
I believe the answer is:
larvae
'young insects' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for larvae that I've seen before include "Insects just out of the eggs" , "Eg, caterpillars" , "Insects in immature state" , "Grubs" , "Wormlike forms of insects" .)