Crossword Genius

Sink aboard vessel (6)

Ross

I believe the answer is:

flagon

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

'sink aboard' is the wordplay.
'sink' becomes 'flag' (flagging is a kind of sinking**).
'aboard' becomes 'on'.
'flag'+'on'='FLAGON'

(Other definitions for flagon that I've seen before include "Large drinks container" , "Wine jug" , "Large container for serving drink" , "Large rounded bottle, may contain cider" , "Drinking vessel" .)

I've seen this clue in The Independent.
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