Shift choice (4)

I believe the answer is:

gear

(Other definitions for gear that I've seen before include "illegal drugs" , "Trendy clothes - changed in car?" , "Toothed wheel which engages with another one" , "Transmission device - kit" , "Toothed wheel mechanism" .)

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.