Crossword Genius

Address of on-line retailer that is into up-cycling is much-visited site (7)

Ross

I believe the answer is:

purlieu

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'site' is the definition.
(thesaurus)

'address of on-line retailer that is into up-cycling is much-visited' is the wordplay.
I cannot quite see how this works, but
'line' could be 'purl' (purl is a kind of line) and 'purl' is present in the answer.
'that is' could be 'ie' (short for Latin 'id est', 'that is') and 'ie' is found in the answer.
A single letter 'u' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for purlieu that I've seen before include "Frequently-visited place" , "Environs" , "The area near a place" , "City's outlying district" , "One's limits or usual haunts" .)

I've seen this clue in The Independent.
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