Rise of an aroma just beginning (7)
I believe the answer is:
nascent
'just beginning' is the definition.
(I've seen this before)
'rise of an aroma' is the wordplay.
'rise of' says the letters should be written backwards (in a down clue, letters go up).
'aroma' becomes 'scent' (synonyms).
'an' written backwards gives 'na'.
'na'+'scent'='NASCENT'
(Other definitions for nascent that I've seen before include "Starting existence" , "Emerging, in the process of being born" , "not yet mature" , "coming into circulation?" , "Incipient" .)