Snare left like this (5)
I believe the answer is:
lasso
'snare' is the definition.
(both can mean to catch or trap)
'left like this' is the wordplay.
'left' becomes 'L' (common abbreviation).
'like this' becomes 'as so' ('as so' can mean 'in this way').
'l'+'asso'='LASSO'
(Other definitions for lasso that I've seen before include "A cowboy's looped lariat" , "Rope with noose for catching animals" , "Ling-nosed rope" , "Rope with 20" , "snare" .)