Shirt button blocker (5)

I believe the answer is:

ascot

(Other definitions for ascot that I've seen before include "Racecourse, home to the Gold Cup since 1807" , "racing centre" , "Berkshire racecourse - coast (anag)" , "Coats (anag) - racecourse" , "Racecourse and cravat" .)

I've seen this clue in the Newsday.

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