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World chess body admits limits of diagonal play (6)

Ross

I believe the answer is:

fiddle

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'play' is the definition.
(fiddling is a kind of playing)

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

Can you help me to learn more?

(Other definitions for fiddle that I've seen before include "Get by cheating, or handle aimlessly" , "Fix" , "Violin - racket" , "One's played" , "Commit fraud; instrument" .)

I've seen this clue in The Telegraph.
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