Crossword Genius

Went from full to gibbous (5)

Ross

I believe the answer is:

waned

(Other definitions for waned that I've seen before include "Decreased in size" , "grew faint" , "(Of moon) grew smaller" , "Ebbed; declined" .)

I've seen this clue in The Wall Street Journal.
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.