Low-flying predator (3)
I believe the answer is:
owl
'predator' is the definition.
(owl is a kind of predator)
'low-flying' is the wordplay.
'flying' indicates an anagram.
'low' with letters rearranged gives 'OWL'.
(Other definitions for owl that I've seen before include "Night hunter" , "Traditionally wise bird" , "Member of Parliament" , "Night person" , "One flying" .)