These, for the most part, describe Income Tax? (6)
I believe the answer is:
tithes
'these for the most part describe income tax?' is the definition.
The definition suggests an adverb but the answer is not.
'these for the most part describe income tax?' is the wordplay.
'for the most part' means to remove the last letter.
'describe' is an insertion indicator.
'income tax?' becomes 'it' (this could be a standard abbreviation I've not previously seen).
'these' with its final letter taken away is 'thes'.
'thes' going around 'it' is 'TITHES'.
Can you help me to learn more?
(Other definitions for tithes that I've seen before include "Levies of one-tenth, to church perhaps" , "Levies of one tenth" , "Church taxes" , "Tenths of income given to church" , "Tenth portions of income given to church" .)