Extra’s stage farewell (3,3)
I believe the answer is:
leg bye
'extra's' is the definition.
(cricket term)
'stage farewell' is the wordplay.
'stage' becomes 'leg' (synonyms).
'farewell' becomes 'bye' (bye is a kind of farewell).
'leg'+'bye'='LEG-BYE'
(Other definitions for leg bye that I've seen before include "Extra 24 across" , "cricketer scoring off his pad" , "Extra run (cricket)" , "Type of run (cricket)" .)