Crossword Genius

Everything unknown to friend (4)

Ross

I believe the answer is:

ally

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Here is my best explanation:

'friend' is the definition.
('ally' can be a synonym of 'friend')

'everything unknown' is the wordplay.
'everything' becomes 'all' (I've seen this before).
'unknown' becomes 'y' (algebra).
'all'+'y'='ALLY'

'to' is the link.

Ross

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This clue was last seen in Mirror

(Other definitions for ally that I've seen before include "Collaborator, affiliate", "Friendly nation", "Crony", "Friend and colleague", "Comrade in arms", "Join - friend", "Team up", "Someone with whom one is in league", "Co-operative friend" and "Colleague, confederate".)

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