Regular incomes peter out into small gratuities (8)
I believe the answer is:
stipends
'regular incomes' is the definition.
The definition and answer can be both related to property as well as being plural nouns.
Maybe there's an association between them I don't understand?
'peter out into small gratuities' is the wordplay.
'peter out' becomes 'end' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'into' is an insertion indicator.
'small' becomes 's' (abbreviation - e.g. clothes size).
'gratuities' becomes 'tips' ('tip' can be a synonym of 'gratuity').
's'+'tips'='stips'
'end' inserted into 'stips' is 'STIPENDS'.
Can you help me to learn more?
(Other definitions for stipends that I've seen before include "Official incomes of clergymen" , "Salaries of clergymen" , "Allowances (clergy)" , "Spends it on clergymen's salaries" , "Regular payments" .)