Flag (for a sailor?) (4)

I believe the answer is:

jack

(Other definitions for jack that I've seen before include "Face card" , "White bowls target" , "Knave; raising device" , "Car lifter" , "Tunic for a soldier" .)

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.