Submarine might be about (1-4)

I believe the answer is:

u-boat

'submarine' is the definition.
(I know that submarine can be written as U-boat)

'might be about' is the wordplay.
'might be' indicates an anagram (I've seen this in other clues).
'about' with letters rearranged gives 'U-BOAT'.

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

I've seen this clue in The Sun.

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