One new Italian leader producing press (6)
I believe the answer is:
induce
'press' is the definition.
(thesaurus)
'one new italian leader' is the wordplay.
'one new' becomes 'in' (I've seen this in other clues).
'italian leader' becomes 'duce' (I've seen this before**).
'in'+'duce'='INDUCE'
'producing' acts as a link.
(Other definitions for induce that I've seen before include "Bring on by artificial means" , "Persuade, hasten childbirth" , "Persuade or bring on, say birth" , "Bring on, cause to happen" , "Give rise to" .)