Britain reflected in Austen novel is most civilised (8)

'most civilised' is the definition.
I can't judge whether this definition defines the answer.

'britain reflected in austen novel' is the wordplay.
'britain' becomes 'br' (abbreviation).
'reflected' says the letters should be written backwards (letters reflected back).
'in' means one lot of letters goes inside another.
'novel' is an anagram indicator (letters in a new or novel order).
'br' in reverse letter order is 'rb'.
'austen' is an anagram of 'uanest'.
'rb' placed within 'uanest' is 'URBANEST'.

'is' is the link.

Can you help me to learn more?