Tailless parrot and one cuckoo returning with a nut (9)
I believe the answer is:
macadamia
'nut' is the definition.
(type of nut)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for macadamia that I've seen before include "Nut-bearing tree" , "nut-tree" , "(Of drug) causing dependency" , "Queensland nut" , "Australian tree with edible nuts - a CIA madam (anag)" .)