Sacre Coeur's winding track (10)
I believe the answer is:
racecourse
'track' is the definition.
(I know that racecourse is a type of track)
'sacre coeur's winding' is the wordplay.
'winding' indicates an anagram.
'sacre'+'coeur'='sacrecoeur'
'sacrecoeur' is an anagram of 'RACECOURSE'.
(Other definitions for racecourse that I've seen before include "Where to find better" , "Doncaster, for example?" , "Eg, Epsom" , "better frequented location?" , "Running track for horses" .)