Core: perfume (7)
I believe the answer is:
essence
I believe this is a double definition.
'core' is the first definition.
(I know that core can be written as essence)
'perfume' is the second definition.
(I know that perfume can be written as essence)
(Other definitions for essence that I've seen before include "A thing's intrinsic nature" , "The most distinctive element" , "Scent; core" , "Perfume or concentrate" , "Concentration; nub" .)