Crossword Genius

Everything unknown to friend (4)

Ross

I believe the answer is:

ally

Here is my best explanation:

'friend' is the definition.

('ally' can be a synonym of 'friend')

'everything unknown' is the subsidiary indication.

'everything' becomes 'all' (I've seen this before).

'unknown' becomes 'y' (algebra).

'all'+'y'='ally'

'to' is the link.

(Other definitions for ally that I've seen before include "One on one's side", "Friend and colleague", "Team up", "Colleague, confederate", "Cooperating country", "Cooperating state", "Co-operating person or nation", "A friendly nation", "Co-operative friend" and "Associate that provides assistance".)

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