Drinks quickly (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
downs
'drinks quickly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for downs that I've seen before include "Southern uplands" , "Drinks in one" , "Naturally part of SE England" , "Gently rolling hills" , "Knocks over; drinks" .)