Egg producers avoid legislation (9)

I believe the answer is:

duckbills

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

'avoid legislation' is the wordplay.
'avoid' becomes 'duck' (duck can mean to avoid).
'legislation' becomes 'bills' (I am not sure about this - if you are sure you should believe this answer much more).
'duck'+'bills'='DUCKBILLS'

Can you help me to learn more?

(Other definitions for duckbills that I've seen before include "Egg producers" , "Australian natives" .)

I've seen this clue in The Sunday Times and The Times.

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