Rosemary, who sings soprano with broadcast choral groups (7)
I believe the answer is:
squires
'broadcast choral groups' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot understand how they can define each other.
'rosemary who sings soprano' is the wordplay.
I cannot quite see how this works, but
'soprano' could be 's' (musical abbreviation) and 's' is found in the answer.
The remaining letters 'quires' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'with' is the link.
Can you help me to learn more?
(Other definitions for squires that I've seen before include "Country gentry" , "country gentlemen" , "Escorts" .)