Predator caught fabulous bird (4)
I believe the answer is:
croc
'predator' is the definition.
I know nothing about this answer so I can't judge whether this works.
'caught fabulous bird' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'fabulous bird' becomes 'roc' (mythical or fabulous giant bird).
'c'+'roc'='CROC'
Can you help me to learn more?
(Other definitions for croc that I've seen before include "Fierce reptile" , "Dangerous reptile" , "Small animal" , "Fierce beast" , "African beast; sounds like piece of pot" .)