Crossword Genius

Side with everybody unknown (4)

Ross

I believe the answer is:

ally

'side' is the definition.
(thesaurus)

'with everybody unknown' is the wordplay.
'with' is a charade indicator (letters next to each other).
'everybody' becomes 'all' (I've seen this in another clue).
'unknown' becomes 'y' (algebra).
'all'+'y' is 'ALLY'.

(Other definitions for ally that I've seen before include "One in cooperation with another" , "Band together" , "Accomplice" , "Associate that provides assistance" , "State formally cooperating with another" .)

I've seen this clue in The Guardian.
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