Speed required when tying this? (4)
I believe the answer is:
knot
'speed' is the definition.
(knot is a nautical measure of speed)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for knot that I've seen before include "Could be a granny or a sheepshank" , "bond, perhaps?" , "Unit of speed used by ships" , "securing tie" , "It makes fast" .)