Berkshire's rugged coast! (5)

I believe the answer is:

ascot

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'berkshire's' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I can't see?

'rugged coast' is the wordplay.
'coast' anagrams to 'ASCOT'.
However, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for ascot that I've seen before include "English racecourse in Berkshire" , "Royal racing venue" , "Berks racecourse" , "English course" , "Necktie with wide square ends" .)

I've seen this clue in the Evening Standard.

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