Calf catcher (6)
I believe the answer is:
lariat
'calf catcher' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lariat that I've seen before include "Long rope with a noose at the end" , "tethering-rope" , "A cowboy's rope with noose" , "Cowcatcher" , "Long noosed rope used to catch animals" .)