Not just any (3)

I think it could be either:

Which length description are you looking for?:

the

'not just any' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for the that I've seen before include "French drink" , "The most frequently occurring word in the Bible (and in this clue!)" , "Article is quite definite" , "SECOND PART OF 23" , "That particular one" .)

I've seen this clue in The Washington Post, the Newsday, the Universal, the LA Times, the USA Today and The Wall Street Journal.

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