He designed new centre in Barcelona with greater diligence (2,9)

I believe the answer is:

le corbusier

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'he designed' is the definition.
The definition suggests a singular noun which matches the answer.

'new centre in barcelona with greater diligence' is the wordplay.
'new' is an anagram indicator.
'centre in' indicates the central letters.
'with' is a charade indicator (letters next to each other).
'greater diligence' becomes 'busier' (I can't justify this - if you can you should give a lot more credence to this answer).
The central letters of 'barcelona' are 'rcelo'.
'rcelo' is an anagram of 'lecor'.
'lecor'+'busier'='LE CORBUSIER'

Can you help me to learn more?

(Other definitions for le corbusier that I've seen before include "Swiss-born French architect and urban planner - I bore ulcers (anag)" , "Swiss-French architect" , "Twentieth century Swiss architect" , "20th century architect" .)

I've seen this clue in The Independent.

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