Bronco catcher (5)
I believe the answer is:
lasso
'bronco catcher' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lasso that I've seen before include "Belgian composer" , "Rope for catching livestock" , "Long noosed rope used to catch animals" , "Rope with noose for catching animals" , "Rancher's rope" .)