A nasty argument chasing last of buskers from a London street (6,3)
I believe the answer is:
savile row
'a london street' is the definition.
(I've seen this before)
'a nasty argument chasing last of buskers' is the wordplay.
'nasty' becomes 'vile' ('vile' can be a synonym of 'nasty'**).
'argument' becomes 'row' (I've seen this before).
'chasing' says to put letters next to each other.
'last of' suggests the final letters.
The final letter of 'buskers' is 's'.
'a'+'vile'+'row'='avilerow'
'avilerow' put after 's' is 'SAVILE ROW'.
'from' acts as a link.
(Other definitions for savile row that I've seen before include "Fitting way" , "Well-known street" , "Street noted for tailoring" , "fitting part of London" , "London's tailoring street" .)