Stores right to break embargoes (5)
I believe the answer is:
barns
'stores' is the definition.
'right to break embargoes' is the wordplay.
'right' becomes 'r' (common abbreviation).
'to break' means one lot of letters goes inside another.
'embargoes' becomes 'bans'.
'r' put within 'bans' is 'BARNS'.
(Other definitions for barns that I've seen before include "Stables" , "Agricultural buildings" , "Agricultural outbuilding" , "Sheds" , "Agricultural outbuildings" .)