Berkshire racecourse (7)
'berkshire racecourse' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ascot that I've seen before include "sporting event" , "racing centre" , "Society race meeting" , "where some of our betters may be" , "English town" .)
'berkshire racecourse' is the definition.
(I've seen this before)
This is all the clue.
(Another definition for newbury that I've seen is " West Berkshire town that has a racecourse".)