What's new in battleship construction (6)
I believe the answer is:
latest
'what's new' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for latest that I've seen before include "Brand new, just out" , "Most up to the minute" , "style of today" , "In vogue" , "Most recent, hot off the press" .)