Battleground of 1944 (5)
I believe the answer is:
anzio
'battleground of 1944' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for anzio that I've seen before include "Italian site of WW2 Allied landing" , "Italian port, site of WWII allied landings" , "Italian WW2 beachhead" , "WW 2 landing in Italy" .)