Crossword Genius

Confirm drink left on board (7)

Ross

I believe the answer is:

support

'confirm' is the definition.
('support' can be a synonym of 'confirm')

'drink left on board' is the wordplay.
'drink' becomes 'sup' (I've seen this before**).
'left on board' becomes 'port' (port is left on board a ship).
'sup'+'port'='SUPPORT'

(Other definitions for support that I've seen before include "Buttress" , "Help; bear" , "Uphold" , "Maintain, back" , "comfort" .)

I've seen this clue in The Telegraph.
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