He's broken out of quarters and disturbs the peace (7)
I believe the answer is:
escapee
'he's broken out' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'quarters and disturbs the peace' is the wordplay.
'quarters' becomes 'es'.
'and' means one lot of letters go next to another.
'disturbs' indicates an anagram (I've seen 'disturbed' mean this (the order of letters is disturbed)).
'peace' is an anagram of 'capee'.
'es'+'capee'='ESCAPEE'
'of' is the link.
Can you help me to learn more?
(Other definitions for escapee that I've seen before include "One who got away" , "Absconder, fugitive" , "One who's broken out of confinement" , "Fugitive from prison" , "One who gets away" .)