Italian island, sign short of corn? (5)
I believe the answer is:
capri
'italian island' is the definition.
(I've seen this before)
'sign short of corn?' is the wordplay.
'sign' becomes 'capricorn' (a sign of the zodiac).
'short of' indicates named letters should be taken away.
'capricorn' with 'corn' taken away is 'CAPRI'.
(Other definitions for capri that I've seen before include "Italian isle" , "Neapolitan isle" , "Location for holiday" , "I carp about the island" , "Romantic Isle in Bay of Naples" .)