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 see how this works, but
'a' is within the answer.
'glaswegian' could be 'scot' (I've seen this in another clue) and 'scot' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
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!" .)