Frontal display aroused dissent and division (4-2)
I believe the answer is:
bust-up
'dissent and division' is the definition.
'frontal display aroused' is the wordplay.
'frontal display' becomes 'bust'.
'aroused' becomes 'up'.
'bust'+'up'='BUST-UP'
(Other definitions for bust-up that I've seen before include "Quarrel, brawl" , "disagreement" , "Argument finishing a relationship" , "Quarrel, possibly ending a friendship" , "Serious quarrel/fight" .)