Crossword Genius

What’s authentic about modern library facility? (7)

Ross

I believe the answer is:

renewal

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'library facility?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'what's authentic about modern' is the wordplay.
'what's authentic' becomes 'real' (authentic means real or genuine).
'about' indicates putting letters inside.
'modern' becomes 'new' (synonyms).
'real' enclosing 'new' is 'RENEWAL'.

Can you help me to learn more?

(Other definitions for renewal that I've seen before include "Revitalisation" , "Extension of validity" , "Regeneration" , "Repair" , "Process of extending a subscription or licence" .)

I've seen this clue in The Times.
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