A note ignored by sentimentalist is perfumed (8)
I believe the answer is:
aromatic
'is perfumed' is the definition.
(I've seen this in another clue)
'a note ignored by sentimentalist' is the wordplay.
'note' becomes 'n' (abbreviation).
'ignored by' suggests deleting specific letters.
'sentimentalist' becomes 'romantic'.
'romantic' with 'n' removed is 'romatic'.
'a'+'romatic'='AROMATIC'
(Other definitions for aromatic that I've seen before include "smelling nice" , "Scented" , "herb, perhaps" , "with distinctive odour" , "Pleasantly smelling" .)