Sick bird we hear? Wrong (7)

I believe the answer is:

illegal

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

'sick bird' is the wordplay.
'sick' becomes 'ill' (synonyms).
'bird' becomes 'egal' (I can't justify this - if you can you should give a lot more credence to this answer).
'ill'+'egal'='ILLEGAL'

'we hear?' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for illegal that I've seen before include "Contrary to law" , "Unauthorised" , "Prohibited by law" , "Forbidden" , "Not lawful" .)

I've seen this clue in The Sun.

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