Obstacle, hindrance (7)
I believe the answer is:
barrier
I believe this clue is a double definition.
'obstacle' is the first definition.
(barrier is a kind of obstacle)
'hindrance' is the second definition.
(barrier is a kind of hindrance)
(Other definitions for barrier that I've seen before include "bar" , "Rear rib creating an obstacle" , "'Blockade, fence (7)'" , "Obstacle to movement" , "Structure preventing access" .)