Shout about ringleader in fight (5)
I believe the answer is:
brawl
'in fight' is the definition.
(I've seen this before)
'shout about ringleader' is the wordplay.
'shout' becomes 'bawl' (I've seen this before).
'about' is an insertion indicator.
'ringleader' becomes 'r' (first letter of ring).
'bawl' placed around 'r' is 'BRAWL'.
(Other definitions for brawl that I've seen before include "Melee" , "Rough, noisy fight" , "Quarrel noisily" , "Rowdy fight" , "Ruckus" .)