Busy bug (3)
'busy bug' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bee that I've seen before include "meeting" , "Hymenopterous insect" , "Busy buzzer" , "Apian insect" , "Insect that bumbles?" .)
(Other definitions for ant that I've seen before include "Proverbially hard-working insect" , "Small social insect" , "The insect lives in a social colony" , "that may be a soldier" , "Six-footer" .)