Very hard to get round London area (4)

I believe the answer is:

soho

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'london area' is the definition.
(I've seen this before)

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

(Other definitions for soho that I've seen before include "Part of London and NY" , "fashionable neighbourhood (or neighborhood)" , "London night life area" , "Entertainment district in London's West End" , "Central London entertainment area" .)

I've seen this clue in The Sun.

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