Like the Battle of Midway (5)
I believe the answer is:
naval
'like the battle of midway' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for naval that I've seen before include "of fighting sailors" , "Relating to marine force" , "Of seaborne forces" , "Relating to nautical defence forces" , "Relating to the Senior Service" .)