One making demands of retired player? (7)
I believe the answer is:
exactor
'one making demands' is the definition.
(someone who exacts or makes demands)
'retired player?' is the wordplay.
'retired' becomes 'ex' (prefix meaning former or onetime).
'player?' becomes 'actor' (synonyms).
'ex'+'actor'='EXACTOR'
'of' acts as a link.
(Other definitions for exactor that I've seen before include "Core tax (anag.)" , "One forcing payment" , "Demanding person" , "Individual demanding" , "demanding type" .)