Bank pays this uncomplicated curiosity (6,8)
I believe the answer is:
simple interest
'bank pays' is the definition.
The answer and definition can be both related to property as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'uncomplicated curiosity' is the wordplay.
'uncomplicated' becomes 'simple' (synonyms).
'curiosity' becomes 'interest' (interest is a kind of curiosity).
'simple'+'interest'='SIMPLE INTEREST'
'this' acts as a link.
Can you help me to learn more?
(Other definitions for simple interest that I've seen before include "herbalist pursues" , "foolish curiosity" , "brings in extra money" , "return from advance" , "return on investment" .)