Crossword Genius

Unlikely to add up if short (4)

Ross

I believe the answer is:

tall

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'unlikely' is the definition.
(I've seen this before)

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(Other definitions for tall that I've seen before include "High in stature" , "Higher than the average person" , "Above average height" , "Unbelievable" , "Towering" .)

I've seen this clue in The Times.
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