One with income from property, not so much? Otherwise! (6)
I believe the answer is:
lessor
'one with income from property' is the definition.
I can't judge whether this definition defines the answer.
'not so much? otherwise' is the wordplay.
'not so much?' becomes 'less' (I've seen this in other clues).
'otherwise' becomes 'or'.
'less'+'or'='LESSOR'
Can you help me to learn more?
(Other definitions for lessor that I've seen before include "Landlord" , "The one who grants a lease" , "One lets" , "The granter of a lease" , "Proprietress is one" .)