Crossword Genius

Huge one going last into saltwater vessel (10)

Ross

I believe the answer is:

brigantine

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'vessel' is the definition.
(brigantine is a kind of vessel)

'huge one going last into saltwater' is the wordplay.
'huge one going' becomes 'igan' (I can't justify this - if you can you should give a lot more credence to this answer).
'last' becomes 't' (I've seen this in other clues).
'into' indicates putting letters inside.
'saltwater' becomes 'brine' (synonyms).
'igan'+'t'='igant'
'igant' inserted into 'brine' is 'BRIGANTINE'.

Can you help me to learn more?

(Other definitions for brigantine that I've seen before include "vessel" , "Boat" , "Two-masted sailing ship" .)

I've seen this clue in The Independent.
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