Twice a year new driver sets out for historic part of Italy (5,6)
I believe the answer is:
papal states
'historic part of italy' is the definition.
(historical Italian territories)
'twice a year new driver sets out' is the wordplay.
'twice' indicates the doubling of some letters.
'a year' becomes 'pa' (per annum).
'new driver' becomes 'l'.
'sets out' becomes 'states'.
'pa' doubled is 'papa'.
'papa'+'l'+'states'='PAPAL STATES'
'for' acts as a link.
(Other definitions for papal states that I've seen before include "Area ruled by the Pope up to 1870" , "old political territory" .)