Like our bird-brained friends (9)

I believe the answer is:

feathered

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

I don't understand how the rest of the clue works.

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(Other definitions for feathered that I've seen before include "like a tumbler?" , "Birds are described as fine . . . . . . . . . friends" , "head of dodo, thus?" , "Like bird" .)

I've seen this clue in the Evening Standard.

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