Crossword Genius

WW2 submarine (1-4)

Ross

I believe the answer is:

u-boat

(Other definitions for u-boat that I've seen before include "About (anag)" , "German World War One or World War Two submarine" , "German wartime submarine" , "German WW 2 sub" , "Submersible warship of WWII" .)

I've seen this clue in The Sun and The Telegraph.
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