Crossword Genius

Turnabout in the vessel (1-4)

Ross

I believe the answer is:

u-boat

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'turnabout' is the first definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'vessel' is the second definition.
(I know that U-boat is a type of submersible)

'in the' acts as a link.

Can you help me to learn more?

(Other definitions for u-boat that I've seen before include "German wartime submarine" , "Take pool exercise" , "German World War One or World War Two submarine" , "About (anag)" , "German submarine of WW2" .)

I've seen this clue in The Globe and Mail.
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