An Aberdonian perhaps in racing venue (5)
I believe the answer is:
ascot
'racing venue' is the definition.
(English race course)
'an aberdonian perhaps' is the wordplay.
'an' becomes 'a'.
'aberdonian perhaps' becomes 'scot' (I've seen this before).
'a'+'scot'='ASCOT'
'in' is the link.
(Other definitions for ascot that I've seen before include "Berkshire racecourse - coast (anag)" , "course without any fences!" , "Fungus affecting wood" , "Type of necktie" , "Horse-racing venue" .)