Brood housed in Hackney estate (3)

I believe the answer is:

eye

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'brood housed' is the definition.
I can't tell whether this defines the answer.

'in hackney estate' is the wordplay.
'in' indicates a hidden word.
'EYE' can be found hidden inside 'hackney estate'.

Can you help me to learn more?

(Other definitions for eye that I've seen before include "Small loop or hole" , "Perception" , "Aim for" , "Organ of vision" , "Needle or lace hole" .)

I've seen this clue in The Telegraph.

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