Maybe a Glaswegian’s course (5)
I believe the answer is:
ascot
'course' is the definition.
(Ascot is a racecourse)
'maybe a glaswegian's' is the wordplay.
I cannot really understand how this works, but
'a' is found in the answer.
'glaswegian' could be 'scot' (I've seen this in another clue) and 'scot' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ascot that I've seen before include "Racecourse, home to the Gold Cup since 1807" , "sporting venue" , "Royal race meeting venue" , "Tie or cravat" , "course without any fences!" .)