Like Pope's impressive article (8)

I believe the answer is:

augustan

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'like pope's impressive article' is the definition.
I can't tell whether this definition defines the answer.

'impressive article' is the wordplay.
'impressive' becomes 'august' (I've seen this before).
'article' becomes 'an' (indefinite article).
'august'+'an'='AUGUSTAN'

Can you help me to learn more?

(Other definitions for augustan that I've seen before include "Pope, say" , "classical writer" .)

I've seen this clue in The Guardian.

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