Bill, joining Edward, performed on stage (5)
I believe the answer is:
acted
'performed on stage' is the definition.
(I've seen this before)
'bill joining edward' is the wordplay.
'bill' becomes 'act' (I've seen this in other clues**).
'joining' is a charade indicator (letters next to each other).
'edward' becomes 'ed'.
'act'+'ed'='ACTED'
(Other definitions for acted that I've seen before include "Appeared in play" , "took part in simulation" , "participated in panto maybe" , "did something!" , "Feigned" .)