Color with a pen (3,2)

I believe the answer is:

ink in

(Other definitions for ink in that I've seen before include "Confirm arrangement" , "Fill with colour" , "confirm initial answer, perhaps" , "Definitely confirm" .)

I've seen this clue in the Universal.

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.