Crossword Genius

As taken to show favouritism? (5)

Ross

I believe the answer is:

sides

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If this is the answer I cannot explain how the clue works.

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(Other definitions for sides that I've seen before include "Sports teams" , "opponents?" , "Teams or flat surfaces" , "Aspects" , "More than one team" .)

I've seen this clue in the Evening Standard.
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