Crossword Genius

All you need is to be determined (3)

Ross

I believe the answer is:

set

This clue is a double definition.

'all' is the first definition.
(thesaurus)

'is to be determined' is the second definition.
('set' can be a synonym of 'determined')

'you need' is the link.

(Other definitions for set that I've seen before include "Mount (precious stone)" , "Mount (gem); scenery" , "Put down the group of games" , "Become solid like jelly" , "Group; unchanging" .)

I've seen this clue in the Evening Standard.
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