Adult Glaswegian perhaps in racing venue
I believe the answer is:
ascot
'racing venue' is the definition.
(I've seen this before)
'adult glaswegian perhaps' is the wordplay.
'adult' becomes 'a'.
'glaswegian perhaps' becomes 'scot' (glaswegian is a kind of Scot).
'a'+'scot'='ASCOT'
'in' is the link.
(Other definitions for ascot that I've seen before include "racing centre" , "Town with racecourse" , "Royal Berkshire race-meeting (and fashion show!)" , "Royal racing venue" , "somewhere in Berks" .)