Brown colour (6)
'brown colour' is the definition.
(I know that tan is a type of brown colour)
This is all the clue.
(Other definitions for tan that I've seen before include "Yellowish brown" , "Make black and blue" , "Turn hide into leather" , "Bronze" , "Skin colour after exposure to ultraviolet rays" .)
(Other definitions for coffee that I've seen before include "Barista's product" , "Breakfast drink" , "Cappuccino or espresso, say" , "Eg, espresso" , "Common drink" .)