Ask audibly for a victim (4)
I believe the answer is:
prey
'for a victim' is the definition.
(prey is a kind of victim)
'ask audibly' is the wordplay.
'ask' becomes 'pray' (I've seen this in another clue).
'audibly' shows a homophone (sound like).
'pray' is a homophone of 'PREY'.
(Other definitions for prey that I've seen before include "Animal sought as food" , "Hunter's quarry" , "Animal hunted or caught for food" , "Animal hunted by another for food" , "Animal's quarry" .)