The bird from the Research Institute? (4)

I believe the answer is:

poll

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'the bird' is the definition.
(poll is a kind of bird)

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

(Other definitions for poll that I've seen before include "Record of opinions" , "Voting process; parrot" , "Vote; trim horns" , "Votes cast at an election" , "Means of ascertaining public opinion with questions" .)

I've seen this clue in the Evening Standard.

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