Shear predator (5)
I believe the answer is:
shark
This clue might be a double definition.
'shear' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'predator' is the second definition.
(I've seen this before)
(Other definitions for shark that I've seen before include "Carnivorous fish" , "(Fishy) extortionist" , "Voracious fish" , "Large ferocious fish" , "One exploiting" .)