How the team was affected? (4)

I believe the answer is:

side

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'affected?' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for side that I've seen before include "This effect is secondary" , "A quarter, or half" , "Position to the right or left of" , "group of players" , "Sporting team" .)

I've seen this clue in The Irish News.

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