A neat soft-drink dispenser (5)
I believe the answer is:
udder
'dispenser' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for udder that I've seen before include "milk supplier" , "Part of a cow" , "Bovine mammary gland" , "What's at rear on cows" , "Cow's milk "bag"" .)