Old Italian coin, something chewed over by bankers ultimately (5)

'old italian coin' is the definition.
(I've seen this in another clue)

'something chewed over by bankers ultimately' is the wordplay.
'something chewed' becomes 'cud' (partly digested food that is rechewed).
'over' becomes 'o' (cricket abbreviation).
'by' says to put letters next to each other.
'ultimately' suggests the final letters.
The last letter of 'bankers' is 's'.
'cud'+'o'='cudo'
'cudo' after 's' is 'SCUDO'.