You smooth figure! (8)
I believe the answer is:
thousand
'figure' is the definition.
(I've seen this before)
'you smooth' is the wordplay.
'you' becomes 'thou' (historical second person pronoun).
'smooth' becomes 'sand' (sanding is a kind of smoothing).
'thou'+'sand'='THOUSAND'
(Other definitions for thousand that I've seen before include "in MCC, but missing double century" , "Cardinal" , "a fair amount?" , "quite a lot" , "See 19 Across" .)