New harmonica dispensing with rudiments of historic musical instrument (7)
I believe the answer is:
ocarina
'musical instrument' is the definition.
(ocarina is a type of wind instrument)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for ocarina that I've seen before include "Small egg-shaped wind instrument with holes for the fingers" , "toy instrument" , "Inca oar made into a musical instrument" , "it's blown in pieces" , "dated instrument" .)