Such stories are eminently untrue (4)
I believe the answer is:
tall
'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" .)