Optimists keep them high (5)

I believe the answer is:

hopes

(Other definitions for hopes that I've seen before include "Aspires" , "Desires and expects" , "Aspirations, wishes" , "Believes that good things may happen" , "Expectations" .)

I've seen this clue in The New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.