Very disappointed not to be quite qualifying for Python sketch? (4,2,1,6)

I believe the answer is:

sick as a parrot

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'very disappointed' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for sick as a parrot that I've seen before include "Extremely disappointed (colloq.)" , "Severely disappointed" , "Awfully disappointed" , "suffering bird flu?" , "Very upset (like Polly?)" .)

I've seen this clue in The Times.

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