Article that's only 60 per cent there? (3)

I believe the answer is:

the

'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 "Base of ever-expanding nursery rhyme" , "That particular one" , "SECOND PART OF 23" , "Born - - - - - - - - (carol)" , "French drink" .)

I've seen this clue in The Times.

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