Rope one so knotted (5)
I believe the answer is:
noose
'rope' is the definition.
(noose is a kind of rope)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for noose that I've seen before include "Looped rope" , "Loop formed by means of a slip knot" , "Rope around the neck" , "trap" , "form of punishment" .)