Reanimated corpse (6)
I believe the answer is:
zombie
'reanimated corpse' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for zombie that I've seen before include "Lethargic person" , "Dead body brought back to life" , "Animated corpse" , "Corpse revived by witchcraft in W Indies" , "Undead monster" .)