Harmony is restored in a mutiny (9)
I believe the answer is:
unanimity
'harmony' is the definition.
(I know that unanimity is a type of accord)
'restored in a mutiny' is the wordplay.
'restored' indicates an anagram (I've seen this in other clues).
'in'+'a'+'mutiny'='inamutiny'
'inamutiny' is an anagram of 'UNANIMITY'.
'is' acts as a link.
(Other definitions for unanimity that I've seen before include "State of total agreement" , "Mutiny in a state of complete agreement" , "Total accord" , "State of accord, no one dissenting" .)