Farm insects (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
ants
'farm insects' 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 "Industrious insects" , "24 [INSECT] s" , "Hard workers" , "Tiny insects that live in colonies" , "Busy little insects" .)