Slight disagreement limiting a king’s list of duties (6)
I believe the answer is:
tariff
'list of duties' is the definition.
(I've seen this in another clue)
'slight disagreement limiting a king's' is the wordplay.
'slight disagreement' becomes 'tiff' (tiff is a kind of disagreement. I am not sure about the 'slight' bit.).
'limiting' means one lot of letters goes inside another.
'king' becomes 'R' (abbreviation for rex, king in Latin).
'a'+'r'='ar'
'tiff' placed around 'ar' is 'TARIFF'.
Can you help me to learn more?
(Other definitions for tariff that I've seen before include "Price list - import tax" , "Table of (hotel) charges" , "List of duties on imports or exports" , "Tax or duty to be paid on some imports or exports" , "Bill of fare" .)