Shoots without opening negotiations (5)
I believe the answer is:
talks
'negotiations' is the definition.
(I've seen this before)
'shoots without opening' is the wordplay.
'shoots' becomes 'stalks'.
'without opening' means to remove the first letter.
'stalks' with its initial letter removed is 'TALKS'.
(Other definitions for talks that I've seen before include "Chats; lectures" , "negotiations" , "Speaks" , "negotiation" , "Verbalises" .)