Epsom race (5)
I believe the answer is:
derby
'epsom race' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for derby that I've seen before include "American bowler" , "Local game" , "Bowler hat (US)" , "Flat race; hat" , "... and after 8 [STATE = KENTUCKY] , meeting" .)