Stole tackle primarily on posh marine vehicle (1-4)

I believe the answer is:

u-boat

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

'marine vehicle' is the definition.
'U-boat' can be an answer for 'vehicle' (U-boat is an example). I'm not certain of the 'marine' bit.

'stole tackle primarily on posh' is the wordplay.
'stole' becomes 'boa' (both can mean a type of scarf).
'primarily' suggests taking the first letters.
'on' is a charade indicator (letters next to each other).
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
The initial letter of 'tackle' is 't'.
'boa'+'t'='boat'
'boat' put after 'u' is 'U-BOAT'.

Can you help me to learn more?

(Other definitions for u-boat that I've seen before include "Sea vessel" , "German wartime submarine" , "Submersible warship of WWII" , "About (anag)" , "German WW 2 sub" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.