Guy Busby-Brown makes cocktail (9)
I believe the answer is:
manhattan
'cocktail' is the definition.
(I know that Manhattan is a type of cocktail)
'guy busby-brown' is the wordplay.
'guy' becomes 'man' (guy can informally mean a man).
'busby' becomes 'hat' (I can't justify this - if you can you should believe this answer much more).
'brown' becomes 'tan' (tan is a kind of brown).
'man'+'hat'+'tan'='MANHATTAN'
'makes' is the link.
Can you help me to learn more?
(Other definitions for manhattan that I've seen before include "It blended with spirit" , "intoxicating drink" , "area of New York City" , "NY borough" , "Island of New York - cocktail" .)