French article finished residue off - not sterile (13)
I believe the answer is:
unpasteurised
'not sterile' is the definition.
I can't judge whether this definition defines the answer.
'french article finished residue off' is the wordplay.
'french article' becomes 'un' (indefinite article in French).
'finished' becomes 'past' (I've seen this in another clue).
'off' indicates anagramming the letters.
'residue' anagrammed gives 'eurised'.
'un'+'past'+'eurised'='UNPASTEURISED'
Can you help me to learn more?
(Other definitions for unpasteurised that I've seen before include "Like milk that's not sterilised" , "(Of milk) not having undergone sterilisation" , "form of milk?" , "As milk may be" .)