Throw a stage party (4)
I believe the answer is:
cast
This could be a double definition.
'throw a stage' is the first definition.
'cast' can be an answer for 'throw' (synonyms). I am unsure of the 'a stage' bit.
'party' is the second definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for cast that I've seen before include "Dramatis personae" , "Select actors for play or film" , "Players < lose" , "Throw a fishing line" , "Allot parts in film, play" .)