Crossword Genius

A hitch, perhaps, at speed (4)

Ross

I believe the answer is:

knot

I believe this is a double definition.

'a hitch perhaps' is the first definition.
(I know that hitch is a type of knot)

'speed' is the second definition.
(knot is a nautical measure of speed)

'at' is the link.

(Other definitions for knot that I've seen before include "one may find in wood" , "Air mile" , "Tangled mass" , "Tie, hitch" , "securing tie" .)

I've seen this clue in the Evening Standard.
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