Where the cows come home (5)
I believe the answer is:
dairy
'where the cows come home' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dairy that I've seen before include "milking cows here" , "Business supplying milk etc" , "Of foods) made from milk" , "milk supplier" , "Type of farm" .)