Drinker may use this bedding on a farm (5)
I believe the answer is:
straw
'drinker may use this bedding on a farm' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
This is the entire clue.
Can you help me to learn more?
(Other definitions for straw that I've seen before include "Animal bedding" , "Means to absorb" , "Stalk - tube for drinking" , "Bedding material for horses etc" , "Stalk of dry grass" .)