March perhaps failing to start, say - none getting active (2,3,2)
I believe the answer is:
on the go
'active' is the definition.
(thesaurus)
'march perhaps failing to start say none' is the wordplay.
'march perhaps' becomes 'month' (march is a kind of month).
'failing to start' means to remove the first letter.
'say' becomes 'eg'.
'none' becomes 'o'.
'month' with its initial letter taken off is 'onth'.
'onth'+'eg'+'o'='ON THE GO'
'getting' acts as a link.
(Other definitions for on the go that I've seen before include "Keeping busy, not stopping" , "Very active (colloq.)" , "Very busy, in constant motion" , "Active, in constant motion" , "Active and energetic" .)