Mallet target (4)
I believe the answer is:
gong
'mallet target' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for gong that I've seen before include "Sound announcing meal" , "Dinner signal" , "Round metal plate struck to resound" , "Source of summons" , "Medal, award or honour (inf)" .)