On radio, prepare a town for a cackling bird (10)
I believe the answer is:
kookaburra
'cackling bird' is the definition.
I don't understand how the rest of the clue works.
(Other definitions for kookaburra that I've seen before include "Large kingfisher (aka laughing jackass)" , "Strident Australian" , "He may be laughing!" , "Australian bird" , "Australian kingfisher" .)