Act independently (6,4,3,5)
I think it could be either:
paddle your own canoe
'act independently' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for go it alone that I've seen before include "Act independently" , "set up as freelancer" , "Take something on, eschewing any help" , "Proceed without the help of others" , "act without help" .)