One listens primarily to upmarket radio plays (7)
I believe the answer is:
auditor
'one listens' is the definition.
I can't tell whether this defines the answer.
'primarily to upmarket radio plays' is the wordplay.
'primarily' suggests taking the first letters.
'plays' indicates an anagram.
The first letters of 'to upmarket' is 'tu'.
'tu'+'radio'='turadio'
'turadio' anagrammed gives 'AUDITOR'.
Can you help me to learn more?
(Other definitions for auditor that I've seen before include "I'll check expense involved" , "Financial checker" , "I hear" , "Examiner of accounts" , "One qualified to check accounts" .)