Barbecue pests (4)
I believe the answer is:
ants
'barbecue pests' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ants that I've seen before include "workers found returning" , "Tiny insects that live in colonies" , "Emmets" , "Industrious insects" , "Six-foot insects" .)