Piano finale not yet determined (7)
I believe the answer is:
pending
'not yet determined' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs sometimes define each other.
'piano finale' is the wordplay.
'piano' becomes 'p' (musical abbreviation).
'finale' becomes 'ending' (I've seen this before).
'p'+'ending'='PENDING'
Can you help me to learn more?
(Other definitions for pending that I've seen before include "imminent" , "undecided" , "Awaiting settlement" , "Outstanding" , "Awaiting action" .)