It's kept by a host of drinkers (3)
I believe the answer is:
inn
'of drinkers' is the definition.
The definition suggests a singular noun which matches the answer.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for inn that I've seen before include "Gray's, Lincoln's" , "Possibly Jamaica" , "Country pub, often with accommodation" , "European river" , "English country pub" .)