Loop of rope (5)
I believe the answer is:
noose
'loop of rope' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for noose that I've seen before include "Loop in a rope made with a slip knot" , "head could go in it" , "Device for capital punishment" , "Hanging loop in rope" , "Hangman's or cowboy's loop" .)