Crossword Genius

German submarine (1-4)

Ross

I believe the answer is:

u-boat

'german submarine' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for u-boat that I've seen before include "German submarine of WW2" , "About (anag)" , "German WW 2 sub" , "German World War One or World War Two submarine" , "Sea vessel" .)

I've seen this clue in The Guardian, The Times, The Mirror, The Sun and The Independent.
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