Outspoken Glaswegian unable to fork out for appetiser (6)
I believe the answer is:
canape
'appetiser' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
(Other definitions for canape that I've seen before include "bite to eat" , "Party snack" , "Piece of finger food" , "Small item of food served with drinks" , "Cocktail delicacy" .)