Such stories are eminently untrue (4)

I believe the answer is:

tall

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'such' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tall that I've seen before include "Towering" , "Bigger than average" , "Lofty; unlikely" , "Vertically large" , "Of great stature" .)

I've seen this clue in The Globe and Mail and The Irish News.

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