Musical term for a quarter note, possibly? (5)

I believe the answer is:

nonet

I'm a little stuck... Click here to teach me more about this clue!

'musical term' is the definition.
The definition suggests a singular noun which matches the answer.

'quarter note possibly?' is the wordplay.
'quarter' becomes 'n' ().
'possibly?' indicates anagramming the letters (I've seen 'possibly' mean this).
'note' with letters rearranged gives 'onet'.
'n'+'onet'='NONET'

'for a' is the link.

Can you help me to learn more?

(Other definitions for nonet that I've seen before include "Tenon (anag.)" , "Work for nine players" , "Piece of music for nine" , "Piece for nine payers" , "Tonne (anag.); music for a group" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.