Baseball player in hole with pop star (7)
I believe the answer is:
pitcher
'baseball player' is the definition.
(pitcher is a kind of baseball player)
'hole with pop star' is the wordplay.
'hole' becomes 'pit' (a pit is a large hole).
'with' says to put letters next to each other.
'pop star' becomes 'Cher' (American singer).
'pit'+'cher'='PITCHER'
'in' is the link.
(Other definitions for pitcher that I've seen before include "source of drink?" , "Baseball bowler and vessel for liquid" , "Vessel with a handle and spout" , "Baseball player; big jug" , "US sportsman" .)