Busy during month, e.g. October (2,3,2)
I believe the answer is:
on the go
'busy' is the definition.
('on the go' can be similar in meaning to 'busy')
'during month e g october' is the wordplay.
'during' indicates a hidden word.
'ON THE GO' is hidden in the letters of 'month e g october'.
(Other definitions for on the go that I've seen before include "Busily active" , "Busy and active" , "Active, in constant motion" , "Very active (colloq.)" , "Moving -- active" .)