Note on one instrument or another (5)
I believe the answer is:
flute
'or another' is the definition.
I can't tell whether this definition defines the answer.
'note on one instrument' is the wordplay.
'note' becomes 'f' (musical note).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'one instrument' becomes 'lute' (lute is a kind of instrument).
'f'+'lute'='FLUTE'
Can you help me to learn more?
(Other definitions for flute that I've seen before include "Narrow wineglass" , "Wind instrument" , "High-pitched woodwind instrument" , "Champagne glass" , "Wine glass; instrument" .)