Isn't __ to; shouldn't

I believe the answer is:

supposed

(Other definitions for supposed that I've seen before include "So-called" , "Reckoned, took to be the case" , "Assumed without proof" , "Imagined, presumed" , "Imagined; assumed" .)

I've seen this clue in The Mirror.

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.