Test consists of loud conflict, outcome of a duel (12)
I believe the answer is:
satisfaction
'outcome of a duel' is the definition.
'satisfaction' can be an answer for 'duel' (thesaurus). I'm unsure of the 'outcome of a' bit.
'test consists of loud conflict' is the wordplay.
'test' becomes 'SAT' (SAT is a type of exam).
'consists of' becomes 'is' (I am not sure about this - if you are sure you should believe this answer much more).
'loud' becomes 'f' (short for forte - 'loud' in music).
'conflict' becomes 'action' (action can mean action in war).
'sat'+'is'+'f'+'action'='SATISFACTION'
Can you help me to learn more?
(Other definitions for satisfaction that I've seen before include "I can't get no - (Rolling Stones)" , "Contentment; reparation" , "Gratification" , "Fulfilment; compensation" , "Pleasure" .)