Theater throwaway (4)
I believe the answer is:
stub
'theater throwaway' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stub that I've seen before include "Possible proof of journey" , "Blunt end" , "Knock (e.g. toe)" , "Strike one's toe accidentally (against something)" , "what smoker drops in street?" .)