One gets only half a dollar, that's the figure (4)
I believe the answer is:
idol
'the figure' is the definition.
(I've seen this before)
'one gets only half a dollar' is the wordplay.
'one' becomes 'i' (Roman numeral).
'gets' means one lot of letters go next to another.
'only half' indicates taking half.
'dollar' halved is 'dol'.
'i'+'dol'='IDOL'
'that's' acts as a link.
(Other definitions for idol that I've seen before include "Something worshipped" , "Graven image or worshipped person" , "Honoured figure" , "Favourite" , "Graven image (sometimes false?)" .)