Crossword Genius

Egg producer to modify duck roosting? (5)

Ross

I believe the answer is:

ovary

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

'egg producer' is the definition.
(I've seen this in another clue)

'modify duck roosting?' is the wordplay.
I cannot really understand how this works, but
'modify' could be 'vary' (I've seen this before) and 'vary' is found in the answer.
'duck' could be 'o' (resembles zero - 'duck' in cricket) and 'o' is found within the answer.
No letters remain.
This may be the basis of clue (or it may be nonsense).

'to' acts as a link.

Can you help me to learn more?

(Other definitions for ovary that I've seen before include "Female reproductive organ" , "Female organ in which eggs are produced" , "Egg producing organ" , "Part of flower" , "from which monthly release scheduled?" .)

I've seen this clue in the Sydney Morning Herald.
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