Bit player facing season in additional play (5,4)
I believe the answer is:
extra time
'additional play' is the definition.
(additional play in a game)
'bit player facing season' is the wordplay.
'bit player' becomes 'extra' (I've seen this before).
'facing' is a charade indicator (letters next to each other).
'season' becomes 'time' (both can mean a period).
'extra'+'time'='EXTRA TIME'
'in' acts as a link.
(Other definitions for extra time that I've seen before include "may lead to penalties" , "could lead to penalties?" , "Additional period of play" , "play's extension" , "this could lead to a shoot-out" .)