Beast in area north of Milan, camouflaged (6)
I believe the answer is:
animal
'beast' is the definition.
(a beast is an animal)
'area north of milan camouflaged' is the wordplay.
'area' becomes 'a' (maths abbreviation).
'north of' means one lot of letters go next to another (in a down clue, some letters go above others).
'camouflaged' indicates an anagram (I've seen this in other clues).
'milan' anagrammed gives 'nimal'.
'a'+'nimal'='ANIMAL'
'in' acts as a link.
(Other definitions for animal that I've seen before include "Living organism characterised by voluntary movement" , "Mammal" , "Beast from Manila" , "something in the zoo?" , "Uncivilised person" .)