Bachelor getting hot drink (6)
'drink' is the definition.
(brandy is a kind of drink)
'bachelor getting hot' is the wordplay.
'bachelor getting' becomes 'b' (I can't explain this - if you can you should believe this answer much more).
'hot' becomes 'randy' ('randy' can be a synonym of 'hot').
Can you help me to learn more?
(Other definitions for brandy that I've seen before include "Grape wine spirit", "Spirit from grapes", "What a hero must drink, according to Dr Johnson", "- - -snap", "& 24 Mincepie accompaniment".)