Pop singer's after whip for a player (7)
I believe the answer is:
catcher
'player' is the definition.
(I know that catcher is a type of baseball player)
'pop singer's after whip' is the wordplay.
'pop singer' becomes 'Cher' (Cher is an American singer).
'after' is a charade indicator (letters next to each other).
'whip' becomes 'cat' (cat o' nine tails, cat for short is a type of whip).
'cher' after 'cat' is 'CATCHER'.
'for a' acts as a link.
(Other definitions for catcher that I've seen before include "fisherman maybe" , "J D Salinger wrote 'The . . . . . . . in the Rye'" , "booked in the rye" , "Famous Salinger novel ''The . . . . . . . In the Rye''" , "J D Salinger write ''The . . . . . . . in the Rye''" .)