Whitechapel houses extremely advanced (2-4)

I believe the answer is:

hi-tech

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'extremely advanced' is the definition.
'hi-tech' can be an answer for 'advanced' (advanced technology). I'm not certain of the 'extremely' bit.

'whitechapel houses' is the wordplay.
'houses' says the answer is hidden in the clue (part of the clue houses the answer).
'HI-TECH' is hidden within 'whitechapel'.

Can you help me to learn more?

(Other definitions for hi-tech that I've seen before include "Electronically advanced" , "latest devices" , "Using modern construction" , "Advanced technology" , "Using the latest science" .)

I've seen this clue in The Independent.

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