Act independently (6,4,3,5)

I think it could be either:

Which length description are you looking for?:

2,2,5

6,4,3,5

go it alone

'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" .)

I've seen this clue in The Guardian.

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