Deutsch Marine submarine (1-4)

I believe the answer is:

u-boat

(Other definitions for u-boat that I've seen before include "Sea vessel" , "German World War One or World War Two submarine" , "Submersible warship of WWII" , "German submarine of WW2" , "Take pool exercise" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.