More descriptive of London? (7)

I believe the answer is:

greater

I'm a little stuck... Click here to teach me more about this clue!

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

I can't explain the remainder of the clue.

(Other definitions for greater that I've seen before include "More significant" , "More important" , "more influential" , "More renowned" , "Larger or more outstanding" .)

I've seen this clue in the Evening Standard.

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