It's upsetting about the taxes (6)
I believe the answer is:
tithes
'taxes' is the definition.
The answer and definition can be both related to property as well as being plural nouns.
Maybe they are linked in a way I don't understand?
'it's upsetting about the' is the wordplay.
'upsetting' is an anagram indicator.
'about' is an insertion indicator.
'its' with letters rearranged gives 'tis'.
'tis' going around 'the' is 'TITHES'.
Can you help me to learn more?
(Other definitions for tithes that I've seen before include "Tenths of income once paid to church" , "Tenth portions of income given to church" , "Levies of one-tenth, to church perhaps" , "Church taxes" , "Tenth parts, levied by a church perhaps" .)