Musical instrument, or instruction for how to play it (5)
I believe the answer is:
piano
'musical instrument' is the definition.
(I know that Piano is a musical instrument)
'instruction for how to play it' is the wordplay.
I cannot really understand how this works, but
'play' could be 'no' (no or noh is a type of Japanese theatre) and 'no' is located in the answer.
The remaining letters 'pia' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'or' acts as a link.
Can you help me to learn more?
(Other definitions for piano that I've seen before include "In music, soflty" , "In musical notation, this means softly" , "Softly, musically speaking" , "soft passage" , "Soft, softly (music)" .)