An article? Definitely! (3)

I believe the answer is:

the

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'an article?' is the definition.
(the definite article in English)

I can't explain the rest of the clue.

(Other definitions for the that I've seen before include "Last words of story" , "Finis" , "Article is quite definite" , "Born - - - - - - - - (carol)" , "Base of ever-expanding nursery rhyme" .)

I've seen this clue in the Evening Standard.

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