One's Queen having arguments about taxes (7)
I believe the answer is:
tariffs
'taxes' is the definition.
(tariffing is a kind of taxing)
'one's queen having arguments about' is the wordplay.
'one' becomes 'a'.
'queen' becomes 'r' (r is abbreviation regina. e.g. in ER ).
'having' says to put letters next to each other.
'arguments' becomes 'tiffs' (I've seen this before**).
'about' indicates putting letters inside.
'a'+'r'='ar'
'ar' going inside 'tiffs' is 'TARIFFS'.
(Other definitions for tariffs that I've seen before include "List of customs duties or charges" , "Lists of charges" , "taxes" .)