Screams of Hoxton's members of parliament (4)

I believe the answer is:

owls

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'members of parliament' is the definition.
(parliament can mean a group of owls)

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

Can you help me to learn more?

(Other definitions for owls that I've seen before include "Nocturnal hooters?" , "Types incredibly wise" , "Members of Parliament" , "Strigiform creatures" , "Slow sort of birds" .)

I've seen this clue in The Times.

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