Crossword Genius

Some secret U-boat? (3)

Ross

I believe the answer is:

tub

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

'some secret u-boat?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'some secret u-boat?' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'TUB' is hidden in the letters of 'secret u boat'.

Can you help me to learn more?

(Other definitions for tub that I've seen before include "Bath; clumsy ship" , "Kind of bath" , "An old-fashioned bath" , "An informal bath or boat" , "'Broad, open vessel (3)'" .)

I've seen this clue in the Evening Standard.
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