Beg audibly for a victim (4)
I believe the answer is:
prey
'for a victim' is the definition.
(prey is a kind of victim)
'beg audibly' is the wordplay.
'beg' becomes 'pray' (synonyms).
'audibly' indicates a 'sounds like' (homophone) clue.
'pray' sounds like 'PREY'.
(Other definitions for prey that I've seen before include "Animal hunted by another for food" , "Quarry, fair game" , "Animal hunted or caught for food" , "Hunted creature" , "Animal's quarry" .)