Crossword Genius

Enter the duck in the list as “farmyard bird” (7)

Ross

I believe the answer is:

rooster

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

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

'enter the duck in the list' is the wordplay.
'enter the duck' becomes 'o' (I can't justify this - if you can you should give a lot more credence to this answer).
'in the' is an insertion indicator.
'list' becomes 'roster' (roster is a kind of list).
'o' put within 'roster' is 'ROOSTER'.

'as' is the link.

Can you help me to learn more?

(Other definitions for rooster that I've seen before include "Early-morning caller" , "Morning caller" , "Male domestic fowl (US)" , "Toreros (anag.)" , "Cockerel (mainly US)" .)

I've seen this clue in the Evening Standard.
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