Three Little Pigs' foe (4)
I believe the answer is:
wolf
'three little pigs' foe' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for wolf that I've seen before include "Seducer - gobble down" , "Howling canine that hunts in packs" , "gorge" , "Devour ravenously" , "22A [WILD DOG]" .)