Crossword Genius

Standards to preserve on vessels (7)

Ross

I believe the answer is:

flagons

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

'standards to preserve on' is the wordplay.
'standards' becomes 'flags' (I've seen this in another clue).
'to preserve' indicates putting letters inside.
'flags' placed around 'on' is 'FLAGONS'.

(Another definition for flagons that I've seen is " Large bottles".)

I've seen this clue in The Telegraph.
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