Chairmen went off dealer in Bordeaux etc (4,8)
I believe the answer is:
wine merchant
'dealer in bordeaux etc' is the definition.
(someone who sells Bordeaux wines)
'chairmen went off' is the wordplay.
'off' is an anagram indicator.
'chairmen'+'went'='chairmenwent'
'chairmenwent' is an anagram of 'WINE-MERCHANT'.
(Other definitions for wine merchant that I've seen before include "Vintner" , "Supplier of alcoholic drinks" .)