Period determined by the moon's phases (5,4)

I believe the answer is:

lunar year

(Other definitions for lunar year that I've seen before include "Period of about 354 days" , "Approximately 354 days" , "Period of twelve new moons" , "Period of 354.3671 days" , "some time on the moon" .)

I've seen this clue in The Guardian.

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.