Coast's mazy racing venue (5)

I believe the answer is:

ascot

I'm a little stuck... Click here to teach me more about this clue!

'racing venue' is the definition.
(English race course)

'coast's mazy' is the wordplay.
'coast' anagrams to 'ASCOT'.
Though, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for ascot that I've seen before include "racing centre" , "where some of our betters may be" , "Posh racecourse" , "Where ladies wear new hats" , "sporting venue" .)

I've seen this clue in The Sun.

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