Private vessel? (3)
I believe the answer is:
vat
'vessel?' is the definition.
(vat is a kind of vessel)
'private' is the wordplay.
'VAT' is hidden within the letters.
But, I am unsure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for vat that I've seen before include "Barrel - tax" , "Large tank; purchase tax" , "Fermentation vessel" , "Deep tank or tax duty" , "Large vessel for storing liquids and a large tax" .)