A conclusive flourish of notes (7)
I believe the answer is:
cadenza
'a conclusive flourish' is the definition.
'cadenza' can be an answer for 'flourish' (thesaurus). I'm not sure about the 'a conclusive' bit.
'notes' is the wordplay.
I cannot quite understand how this works, but
'notes' could be 'de' (two musical notes) and 'de' is located in the answer.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for cadenza that I've seen before include "Virtuoso passage by solo performer" , "Elaborate passage for solo instrument or voice" , "Soloist's virtuoso passage" , "One's passage" , "Virtuoso solo passage near the end of a piece of music" .)