Crossword Genius

Ones playing the game believe in games kit (10)

Ross

I believe the answer is:

sportswear

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'kit' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sportswear that I've seen before include "Gear" , "in which triathletes swim" , "Kit for games" , "clothes for play" , "Clothing" .)

I've seen this clue in The Independent.
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