An example of this would be The Thing (7)

I believe the answer is:

article

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

I can't explain the rest of the clue.

(Other definitions for article that I've seen before include "Maybe the" , "Division" , "thing required" , "Rile cat (anag.)" , "to cause amusement, say, to a king" .)

I've seen this clue in The Sunday Times and The Times.

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