Obstacle to progress (7)
'obstacle to progress' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sticking point that I've seen before include "Impasse" , "Obstacle to progress" .)
'obstacle to progress' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for inertia that I've seen before include "Unresponsiveness" , "Resistance to movement" , "Motionlessness" , "Lack of activity" , "Slowness to act, lassitude" .)