Stole cab around blockage (8)
I believe the answer is:
obstacle
'blockage' is the definition.
(thesaurus)
'stole cab around' is the wordplay.
'around' indicates anagramming the letters.
'stole'+'cab'='stolecab'
'stolecab' with letters rearranged gives 'OBSTACLE'.
(Other definitions for obstacle that I've seen before include "It obstructs or hinders" , "The problem" , "Thing that obstructs progress" , "A spanner in the works?" , "Block to progress" .)