Crossword Genius

Obstacle to progress (7)

Ross

I think it could be either:

Which length description are you looking for?:

7

8,5

'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" .)

I've seen this clue in the LA Times.
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