A knotty little snag (5)

I believe the answer is:

hitch

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'snag' is the definition.
(I know that snag is a more specific form of hitch)

I don't understand the rest of the clue.

(Other definitions for hitch that I've seen before include "Temporary obstacle" , "Technical problem" , "Unforeseen obstacle" , "Make fast" , "get a free ride" .)

I've seen this clue in the Evening Standard.

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