Not obstructing other road users, being fair (8)

I believe the answer is:

passable

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'being fair' is the definition.
('passable' can be a synonym of 'fair')

I can't explain the remainder of the clue.

(Other definitions for passable that I've seen before include "examinations should be!" , "OK" , "Merely satisfactory" , "Fairly good but not outstanding" , "not hogging the road" .)

I've seen this clue in the Evening Standard.

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