A toff too? (2,4)
I believe the answer is:
'too' is the definition.
'a toff' is the wordplay.
'toff' becomes 'swell' (wealthy or high-class person).
(Other definitions for as well that I've seen before include "with equal effect" , "Also, in addition" , "A swell sort of addition" , "on top" , "To boot" .)