Rope used for catching cattle (5)
I believe the answer is:
lasso
'rope used for catching cattle' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for lasso that I've seen before include "Rope for throwing" , "What cowboy uses" , "Rope for a cowboy" , "Rope with 20" , "A cowboy's rope with a running noose" .)