Figure to get one for half a dollar (4)
I believe the answer is:
idol
'figure' is the definition.
(I've seen this before)
'one for half a dollar' is the wordplay.
'one' becomes 'i' (Roman numeral).
'for' means one lot of letters go next to another.
'half a' suggests halving the letters.
'dollar' with half the letters taken is 'dol'.
'i'+'dol'='IDOL'
'to get' acts as a link.
(Other definitions for idol that I've seen before include "Figure of worship" , "Who's greatly respected" , "Darling" , "Billy" , "One much admired" .)