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 a hidden word.
'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" .)