Busy, busy, busy (2,3,2)
I believe the answer is:
on the go
'busy busy busy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for on the go that I've seen before include "Always busy" , "Ever busy" , "Active, in constant motion" , "Very busy, in constant motion" , "Busy and active" .)