Pile he leaves here with player (7)
I believe the answer is:
reactor
'pile' is the definition.
(I've seen this before)
'he leaves here with player' is the wordplay.
'leaves' is a deletion indicator.
'with' is a charade indicator (letters next to each other).
'player' becomes 'actor' (synonyms).
'here' with 'he' removed is 're'.
're'+'actor'='REACTOR'
(Other definitions for reactor that I've seen before include "device that's energy-producing" , "nuclear vessel" , "source of power, perhaps" , "chemical substance!" , "Provider of nuclear power" .)