Son has a nasty argument: he may be suited here (6,3)
I believe the answer is:
savile row
'he may be suited here' is the definition.
(London street known for tailoring)
'son has a nasty argument' is the wordplay.
'son' becomes 's'.
'has' says to put letters next to each other.
'nasty' becomes 'vile' ('vile' can be a synonym of 'nasty'**).
'argument' becomes 'row' (I've seen this before).
's'+'a'+'vile'+'row'='SAVILE ROW'
(Other definitions for savile row that I've seen before include "fitting part of London" , "Top tailors' street" , "Mayfair street" , "Fitting way" , "Street noted for tailoring" .)