Tidy way to serve whisky? (4)
I believe the answer is:
neat
I believe this is a double definition.
'tidy' is the first definition.
(similar in meaning)
'way to serve whisky?' is the second definition.
(whisky served without a mixer is 'neat')
(Other definitions for neat that I've seen before include "Steers" , "cow maybe" , "Clean and orderly" , "Tidy and spruce" , "Trim - undiluted" .)