One may produce milk, haphazardly as I infer (8)
I believe the answer is:
friesian
'one may produce milk' is the definition.
(Friesian is a type of cow)
'haphazardly as i infer' is the wordplay.
'haphazardly' indicates an anagram.
'as'+'i'+'infer'='asiinfer'
'asiinfer' with letters rearranged gives 'FRIESIAN'.
(Other definitions for friesian that I've seen before include "Black and white cattle breed" , "Monochrome cow" , "Source of beef" , "from Holland" , "source of milk" .)