Scent of a Woman
'scent of a woman' is the definition.
(I've seen this in another clue)
'a woman' is the wordplay.
'woman' becomes 'roma' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'roma'='AROMA'
Can you help me to learn more?
(Other definitions for aroma that I've seen before include "particular charm" , "Fragrance of spices" , "Distinctive scent" , "Redolence" , "Savour" .)