Basically found within perfume (2,7)
I believe the answer is:
in essence
'basically' is the definition.
(synonyms)
'within perfume' is the wordplay.
'within' becomes 'in'.
'perfume' becomes 'essence' (synonyms).
'in'+'essence'='IN ESSENCE'
'found' acts as a link.
(Other definitions for in essence that I've seen before include "Substantially" , "at bottom" , "Basically" , "Fundamentally" .)