Racecourse in Nova Scotia (5)
I believe the answer is:
ascot
'racecourse' is the definition.
(British racecourse)
'in nova scotia' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ASCOT' is hidden within 'nova scotia'.
(Other definitions for ascot that I've seen before include "Racecourse near Windsor" , "somewhere in Berks" , "Society race meeting" , "Tie round the neck" , "Royal racing venue" .)