A fat figure (5)
I believe the answer is:
gross
This clue could be a double definition.
'a fat' is the first definition.
(thesaurus)
'figure' is the second definition.
The answer and definition can be both related to property as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
Can you help me to learn more?
(Other definitions for gross that I've seen before include "Make altogether" , "144 - vulgar - bloated - before tax" , "Flagrant - unpleasant - 144" , "Product of 12s" , "Not refined, vulgar like 12 dozen" .)