Crossword Genius

Choose to be (in or out) (3)

Ross

I believe the answer is:

opt

(Other definitions for opt that I've seen before include "Have preference for something" , "Select as a preferable alternative" , "Pick from pot" , "Hold in the highest esteem" , "Choose from pot" .)

I've seen this clue in The 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.