Assistant used on-line articles about classical law (5)

I believe the answer is:

alexa

'assistant used on-line' is the definition.
(Alexa is a virtual assistant)

'articles about classical law' is the wordplay.
'articles' becomes 'aa' (the English indefinite article written twice).
'about' is an insertion indicator.
'classical law' becomes 'lex' ('law' in Latin).
'aa' placed around 'lex' is 'ALEXA'.

I've seen this clue in The Times.

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