Human who turns lupine at the full moon (8)
I believe the answer is:
werewolf
'human who turns lupine at the full moon' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for werewolf that I've seen before include "A monster able to change from human into a rapacious animal" , "Full moon shape-changer" , "Hairy beast" , "hybrid" , "Human who turns lupine at the full moon" .)