Bag more, unusually, in trade ban (7)
I believe the answer is:
embargo
'trade ban' is the definition.
(I've seen this before)
'bag more unusually' is the wordplay.
'unusually' indicates an anagram.
'bag'+'more'='bagmore'
'bagmore' with letters rearranged gives 'EMBARGO'.
'in' acts as a link.
(Other definitions for embargo that I've seen before include "restrict trade" , "Ban, veto" , "Legal restraint" , "Commercial ban" , "Commercial break" .)