Musical group married to monarch (7)
I believe the answer is:
consort
'monarch' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'musical group married to' is the wordplay.
'musical' becomes 'con' (I can't justify this - if you can you should believe this answer much more).
'group' becomes 'sort'.
'married to' is a charade indicator (letters next to each other).
'con'+'sort'='CONSORT'
Can you help me to learn more?
(Other definitions for consort that I've seen before include "Hang out with" , "Marriage partner" , "helpmate" , "Group playing music" , "Monarch's husband" .)