Marcher's drum (5)
I believe the answer is:
snare
'marcher's drum' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for snare that I've seen before include "Trap or entangle" , "Loop of wire as trap" , "Trap with noose for catching animals or birds" , "Gin, possibly" , "Animal trap" .)