Blockage, hindrance (8)
I believe the answer is:
obstacle
I believe this clue is a double definition.
'blockage' is the first definition.
(thesaurus)
'hindrance' is the second definition.
(I know that obstacle is a type of hindrance)
(Other definitions for obstacle that I've seen before include "Progress blocker" , "The problem" , "Block to progress" , "A spanner in the works?" , "Thing that obstructs progress" .)