Most stupid birds might be found here? (7)

I believe the answer is:

inanest

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'most stupid' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for inanest that I've seen before include "Most cuckoo" , "Exhibiting minimal sense" , "Most silly" , "most senseless" , "Most stupid" .)

I've seen this clue in The Guardian.

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