Preakness Stakes racetrack (7)
I believe the answer is:
pimlico
'preakness stakes racetrack' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pimlico that I've seen before include "Central London area" , "London area near Victoria" , "Passport to - was an Ealing comedy film" , "Passport to - (nineteen forty nine Ealing comedy)" , "aka South Belgravia" .)