Darth Vader's childhood nickname (3)
I believe the answer is:
'darth vader's childhood nickname' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ani that I've seen before include "Black cuckoo" , "Bird of the cuckoo family" , "Black bird" , "Tropical bird" , "Indigo dye." .)