Crossword Genius

Racecourse punters not exploited yet (9)

Ross

I believe the answer is:

newmarket

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

I can't explain the remainder of the clue.

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(Other definitions for newmarket that I've seen before include "Racecourse - card game" , "Racing town" , "horse-racing centre" , "course?" , "Betting card came" .)

I've seen this clue in The Sunday Times and The Times.
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