Percussion instruments (5)
'percussion instruments' is the definition.
(drum is a kind of percussion instrument)
This is all the clue.
(Other definitions for drums that I've seen before include "Percussion instruments" , "Containers" .)
(Other definitions for bells that I've seen before include "Ringing objects" , "Musical instruments" , "Scotch?" , "Those ringing in the New Year" , "Chimes" .)