Having no certain course (7)

I believe the answer is:

erratic

(Other definitions for erratic that I've seen before include "Unpredictable - car tire (anag)" , "Shifting, unpredictable" , "Not regular in pattern" , "Liable to sudden unpredictable change" , "Sporadic" .)

I've seen this clue in the Sydney Morning Herald.

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.