Crossword Genius

Highly unlikely (4)

Ross

I believe the answer is:

tall

I'm a little stuck... Click here to teach me more about this clue!

'unlikely' is the definition.
(as in a tall tale)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tall that I've seen before include "description of a giraffe?" , "Remarkable" , "Above average height" , "hard to believe in" , "Vertically large" .)

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