Space to get angry after ending of negotiations (7)
I believe the answer is:
storage
'space' is the definition.
'to get angry after ending of negotiations' is the wordplay.
'get angry' becomes 'rage' (I've seen this in another clue).
'after' is a charade indicator (letters next to each other).
'ending of' indicates one should take the final letters.
The last letter of 'negotiations' is 's'.
'to'+'rage'='torage'
'torage' put after 's' is 'STORAGE'.
(Other definitions for storage that I've seen before include "Space available for keeping goods" , "safekeeping" , "reservation?" , "Longer-term laying up" , "What repository provides; so great (anag.)" .)