Accountant finds gold key and riot breaks out (7)
I believe the answer is:
auditor
'accountant' is the definition.
(I know that auditor is a type of accountant)
'gold key and riot breaks out' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'key' becomes 'd' (musical key).
'and' is a charade indicator (letters next to each other).
'breaks out' is an anagram indicator.
'riot' anagrammed gives 'itor'.
'au'+'d'+'itor'='AUDITOR'
'finds' is the link.
(Other definitions for auditor that I've seen before include "Accountant - listener" , "Listener; checker" , "Examiner of accounts" , "Person checking business accounts" , "I hear" .)