Crossword Genius

Standard for example aboard vessel (6)

Ross

I believe the answer is:

flagon

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

'standard for example aboard' is the wordplay.
'standard for example' becomes 'flag' (standard is a kind of flag).
'aboard' becomes 'on'.
'flag'+'on'='FLAGON'

(Other definitions for flagon that I've seen before include "Large vessel with a handle and spout" , "Red or white container" , "Wine jug" , "Large rounded bottle, may contain cider" , "Large bottle for alcohol" .)

I've seen this clue in The Times.
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