Undersea menace could be about (1-4)
I believe the answer is:
u-boat
'undersea menace' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'could be about' is the wordplay.
'could be' indicates an anagram.
'about' is an anagram of 'U-BOAT'.
Can you help me to learn more?
(Other definitions for u-boat that I've seen before include "Sea vessel" , "German World War One or World War Two submarine" , "Submersible warship of WWII" , "Take pool exercise" , "Submersible warship armed with torpedoes" .)