Very large bird I disturbed with green rump? Nope (7,7)

I believe the answer is:

emperor penguin

I'm a little stuck... Click here to teach me more about this clue!

'very large bird' is the definition.
'emperor penguin' can be an answer for 'bird' (I have seen 'Large bird' mean 'emperor penguin' so perhaps 'bird' could also mean 'emperor penguin'). I'm unsure of the 'very large' bit.

'i disturbed with green rump? nope' is the wordplay.
'disturbed with' indicates an anagram (the order of letters is disturbed).
'green'+'rump'+'nope'='greenrumpnope'
'i' mixed up with 'greenrumpnope' can make 'EMPEROR PENGUIN'.

Can you help me to learn more?

(Other definitions for emperor penguin that I've seen before include "Antarctic bird, largest of its type" , "Large bird" .)

I've seen this clue in The Telegraph.

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