Scotsman and his flash masculine pride (8)
I believe the answer is:
machismo
'masculine pride' is the definition.
(I've seen this before)
'scotsman and his flash' is the wordplay.
'scotsman' becomes 'mac'.
'and' means one lot of letters go next to another.
'flash' becomes 'mo' (I've seen this in other clues).
'mac'+'his'+'mo'='MACHISMO'
(Other definitions for machismo that I've seen before include "strength" , "Exaggerated masculine pride" , "Cult of virility" , "Exaggerated sense of manliness" , "virile obsession" .)