To begin with, Calvin Klein makes little money (6)
I believe the answer is:
nickel
'little money' is the definition.
The definition and answer can be both related to property as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'to begin with calvin klein makes' is the wordplay.
'to begin with' suggests taking the first letters.
'makes' indicates an anagram.
The first letter of 'calvin' is 'c'.
'c'+'klein'='cklein'
'cklein' anagrammed gives 'NICKEL'.
Can you help me to learn more?
(Other definitions for nickel that I've seen before include "Coin worth half a dime" , "An American 5-cent coin" , "Element; five cents in US" , "Metal - US coin" , "5c coin" .)