Break into most of Burgundy, say, procured by barman? (6)
I believe the answer is:
breach
'break into' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for breach that I've seen before include "Break, an agreement say" , "Fissure" , "Gap (in defensive wall)" , "Break (in a wall, etc)" , "Contravention" .)