Caterpillars and such (6)
I believe the answer is:
larvae
'caterpillars and such' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for larvae that I've seen before include "Immature forms of invertebrates" , "Eg, caterpillars" , "Insects in the first stage of life" , "Insects in immature state" , "Grubs" .)