Crossword Genius

A knotty snag (5)

Ross

I believe the answer is:

hitch

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'snag' is the definition.
(synonyms)

I don't understand how the remainder of the clue works.

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(Other definitions for hitch that I've seen before include "Setback" , "Snag, drawback" , "Make fast" , "Unexpected problem" , "Tether (rope); difficulty" .)

I've seen this clue in the Evening Standard.
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