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Sub (1-4)

Ross

There are a few possibilities for this:

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1-4

4,2 9*

'sub' is the definition.
(I know that U-boat is a type of attack submarine)

This is all the clue.

(Other definitions for u-boat that I've seen before include "German submarine of WW2" , "Take pool exercise" , "Submersible warship armed with torpedoes" , "German WW 2 sub" , "German wartime submarine" .)

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