Eg, a Glaswegian (4)
I believe the answer is:
scot
'eg a glaswegian' is the definition.
(glaswegian is a kind of Scot)
This is all the clue.
(Other definitions for scot that I've seen before include "Highlander, say" , "---- free: originally free from penalties of taxation" , "Ancient tax" , "No longer tax" , "Glaswegian perhaps" .)