Crossword Genius

Trick played with arrangement of equipment? (5)

Ross

I believe the answer is:

setup

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'equipment?' is the definition.
(I know that setup is a type of equipment)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for setup that I've seen before include "Fix" , "Organisation (informal)" .)

I've seen this clue in The Irish Times.
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