They can't fly but they can play (5)

I believe the answer is:

kiwis

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'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps they are linked in a way I don't understand?

I can't explain the rest of the clue.

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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