Milk consumption (3)
I believe the answer is:
use
I believe this clue is a double definition.
'milk' is the first definition.
(both can mean to exploit)
'consumption' is the second definition.
(I know that consumption can be written as use)
(Other definitions for use that I've seen before include "Bring into play" , "Sue for employment" , "Profit" , "Employ - custom" , "Take drugs regularly" .)