Nasty argument on appeal that will suit you well (6,3)
I believe the answer is:
savile row
'will suit you well' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'nasty argument on appeal' is the wordplay.
'nasty' becomes 'vile' (synonyms).
'argument' becomes 'row' (to row is to argue).
'on' means one lot of letters go next to another.
'appeal' becomes 'SA' (old-fashioned abbreviation for sex appeal).
'vile'+'row'='vilerow'
'vilerow' after 'sa' is 'SAVILE ROW'.
'that' acts as a link.
Can you help me to learn more?
(Other definitions for savile row that I've seen before include "London tailors' street" , "Fitting way" , "Mayfair street" , "Well-known street" , "Street noted for tailoring" .)