Hillary leaves hallucinatory bird with massive bill (6)
I believe the answer is:
toucan
'bird with massive bill' is the definition.
'toucan' can be an answer for 'bird' (I've seen this before). I am not certain of the 'with massive bill' bit.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for toucan that I've seen before include "Brightly-coloured tropical bird with large beak" , "Fruit-eating bird" , "Showy bird" , "Bird with a large brightly-coloured bill" , "Sounds as if a pair is able for the tropical bird" .)