Shout around start of rowdy punch-up (5)
I believe the answer is:
brawl
'punch-up' is the definition.
(I've seen this before)
'shout around start of rowdy' is the wordplay.
'shout' becomes 'bawl' (I've seen this before**).
'around' is an insertion indicator.
'start of' indicates taking the first letters.
The first letter of 'rowdy' is 'r'.
'bawl' placed around 'r' is 'BRAWL'.
(Other definitions for brawl that I've seen before include "I'd punt for a learned person" , "squabble" , "Affray" , "Rowdy fight" , "Fracas" .)