Gate or fence (7)
I believe the answer is:
barrier
This clue is a double definition.
'gate' is the first definition.
(I know that barrier is a type of gate)
'fence' is the second definition.
(I've seen this before)
(Other definitions for barrier that I've seen before include "Boom" , "Thing preventing passage or access" , "Obstacle to progress" , "'Blockade, fence (7)'" , "Structure preventing access" .)