Crossword Genius

Where chess players meet, heading for drink? (9)

Ross

I believe the answer is:

overboard

'heading for drink?' is the definition.
(the drink can mean the sea)

I don't understand the rest of the clue.

(Other definitions for overboard that I've seen before include "Off boat into water" , "Man ??? - he's fallen off the ship" , "Man . . . . . . . . . - launch the lifeboat!" , "Very enthusiastic" , "having made a splash" .)

I've seen this clue in The Times.
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