An article, that's definite (3)

I believe the answer is:

the

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

I don't understand the remainder of the clue.

(Other definitions for the that I've seen before include "Over - - moon" , "French drink" , "That particular one" , "Born - - - - - - - - (carol)" , "15, 16 One given taste of own medicine" .)

I've seen this clue in the Evening Standard.

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