Player’s agent introducing celebrities (15)
I believe the answer is:
instrumentalist
'player's' is the definition.
(someone who plays an instrument)
'agent introducing celebrities' is the wordplay.
I cannot quite understand how this works, but
'celebrities' could be 'alist' (A-list) and 'alist' is present in the answer.
The remaining letters 'instrument' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for instrumentalist that I've seen before include "one of the band" , "musician" , "oboe, perhaps" .)