Old bread companion leaves in theatre (5)
I believe the answer is:
drama
'theatre' is the definition.
(thesaurus)
'old bread companion leaves' is the wordplay.
'old bread' becomes 'drachma' (former currency or bread of Greece).
'companion' becomes 'ch' (I've seen this in other clues).
'leaves' suggests deleting specific letters.
'drachma' with 'ch' removed is 'DRAMA'.
'in' is the link.
(Other definitions for drama that I've seen before include "Turbulent emotional episode" , "Play, emotional series of events" , "Theatrical play" , "Tragic situation" , "Plays as branch of literature" .)