Legendary bird eaten by crocodile (3)
I believe the answer is:
roc
'legendary bird' is the definition.
(I've seen this before)
'eaten by crocodile' is the wordplay.
'eaten by' indicates the answer is hidden within the clue.
'ROC' can be found hidden inside 'crocodile'.
(Other definitions for roc that I've seen before include "Huge mythical bird of prey" , "Legendary thing" , "Gigantic bird of eastern legend - cor!" , "Enormous, mythical bird of prey" , "fabulous bird is seen" .)