Perfume for money, we hear (5)
I believe the answer is:
scent
'perfume' is the definition.
('scent' can be a synonym of 'perfume')
'money we hear' is the wordplay.
'money' becomes 'cent' (I've seen this before).
'we hear' indicates a 'sounds like' (homophone) clue.
'cent' sounds like 'SCENT'.
'for' acts as a link.
(Other definitions for scent that I've seen before include "Whiff" , "Clue" , "Track; aroma" , "Get wind of" , "Number of clues" .)