Crossword Genius

Doubles player, with back gone, retires, giving set up (6)

Ross

I believe the answer is:

entrap

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'set up' is the definition.
('entrap' can be a synonym of 'set up')

I cannot understand how the rest of the clue works.

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(Other definitions for entrap that I've seen before include "Snare, trick" , "Catch - frame" , "Frame -- stitch up" , "net" , "Set up" .)

I've seen this clue in The Independent.
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