Crossword Genius

Submarine about to be destroyed (1-4)

Ross

I believe the answer is:

u-boat

'submarine' is the definition.
('U-boat' can be a synonym of 'submarine')

'about to be destroyed' is the subsidiary indication.
'to be destroyed' indicates an anagram.
'about' with letters rearranged gives 'uboat'.

(Other definitions for u-boat that I've seen before include "Take pool exercise" , "Submersible warship armed with torpedoes" , "German submarine of WW2" , "Sea vessel" , "About (anag)" .)

I've seen this clue in The Times.
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