Upset open vessel (8)

I believe the answer is:

overturn

'upset' is the definition.
(synonyms)

'open vessel' is the wordplay.
'open' becomes 'overt' (synonyms).
'vessel' becomes 'urn' (urn is a type of container).
'overt'+'urn'='OVERTURN'

(Other definitions for overturn that I've seen before include "Invert" , "Reverse (legal ruling)" , "Topple or capsize" , "Reverse (decision)" , "Reverse; upend" .)

I've seen this clue in The Telegraph.

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