Crossword Genius

Extremely brazen, his sister’s cultivated national identity (11)

Ross

I believe the answer is:

britishness

'national identity' is the definition.

'extremely brazen his sister's cultivated' is the wordplay.
'extremely' means to remove the middle letters.
'cultivated' is an anagram indicator.
'brazen' with its centre removed is 'bn'.
'bn'+'his'+'sister'='bnhissister'
'bnhissister' is an anagram of 'BRITISHNESS'.

(Another definition for britishness that I've seen is " National quality".)

I've seen this clue in The Times.
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