Clatter (6)
I believe the answer is:
rattle
'clatter' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for rattle that I've seen before include "rabbit" , "Noisy device < to throw" , "making one upset" , "Baby's toy - racket - disconcert" , "Disconcert - English conductor, b. 1955" .)