Crossword Genius

Hope earnestly not to be short (4)

Ross

I believe the answer is:

long

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

'not to be short' is the definition.
('long' is the opposite to 'short')

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for long that I've seen before include "summer break?" , "hunger" , "extended period" , "Protracted" , "Sustained" .)

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