Percussion instruments, but trumpets, etc., have them (5)

I believe the answer is:

bells

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'percussion instruments' is the definition.
(bell is a kind of percussion instrument)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for bells that I've seen before include "Chimes" , "Scotch?" , "Ringing objects" , "Summoned by -- (Betjeman)" , "Those ringing in the New Year" .)

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