Confusion of combatants (5)
I believe the answer is:
melee
This could be a double definition.
'confusion' is the first definition.
(I've seen this in another clue)
'of combatants' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for melee that I've seen before include "A confused free-for-all" , "Fracas" , "Affray; muddled group" , "Noisy riotous fight" , "Confused brawl" .)