Wall, partition (7)
I believe the answer is:
barrier
I believe this clue is a double definition.
'wall' is the first definition.
(I've seen this before)
'partition' is the second definition.
(thesaurus)
(Other definitions for barrier that I've seen before include "Boom" , "it's soundly broken!" , "Stockade - obstacle" , "dam" , "fencing?" .)