Raincoat flash capturing the man's masculinity (8)
I believe the answer is:
machismo
'masculinity' is the definition.
(machismo is a kind of masculinity)
'raincoat flash capturing the man's' is the wordplay.
'raincoat' becomes 'mac' (mac is a kind of raincoat).
'flash' becomes 'mo' (I've seen this in other clues).
'capturing' means one lot of letters goes inside another.
'the man's' becomes 'his' (I've seen this before).
'mac'+'mo'='macmo'
'macmo' placed around 'his' is 'MACHISMO'.
(Other definitions for machismo that I've seen before include "Exaggerated masculine pride" , "Hi, commas, strangely, might have exaggerated masculinity" , "A show of virility or manliness" , "Aggressive masculine pride" , "Exaggerated virility" .)