Aardvark meal (4)
I believe the answer is:
ants
'aardvark meal' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ants that I've seen before include "Busy little insects" , "Inhabitants of a formicary" , "Tiny insects that live in colonies" , "Six-foot insects" , "Hard workers" .)