Craft about to capsize (1-4)

I believe the answer is:

u-boat

'craft' is the definition.
(U-boat is an example)

'about to capsize' is the wordplay.
'to capsize' is an anagram indicator (I've seen 'capsized' mean this).
'about' is an anagram of 'U-BOAT'.

(Other definitions for u-boat that I've seen before include "German submarine of WW2" , "German World War One or World War Two submarine" , "Submersible warship of WWII" , "Submersible warship armed with torpedoes" , "Sea vessel" .)

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

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