Crossword Genius

All black birds? (5)

Ross

I believe the answer is:

kiwis

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'birds?' is the definition.
(kiwi is a kind of bird)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for kiwis that I've seen before include "NZ birds or team" , "Flightless birds of New Zealand" , "Flightless birds and fruits" .)

I've seen this clue in the Evening Standard.
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