Spat, receiving a plumber’s latest list of charges (6)
I believe the answer is:
tariff
'list of charges' is the definition.
(I've seen this before)
'spat receiving a plumber's latest' is the wordplay.
'spat' becomes 'tiff' ('tiff' can be a synonym of 'spat').
'receiving' means one lot of letters goes inside another.
'latest' indicates one should take the final letters.
The final letter of 'plumber' is 'r'.
'a'+'r'='ar'
'tiff' enclosing 'ar' is 'TARIFF'.
(Other definitions for tariff that I've seen before include "Export/import duty" , "Fees schedule" , "List of fixed charges as in hotel" , "List of fixed charges as in hotels" , "List of prices or charges" .)