Backsplash binder (5)

I believe the answer is:

grout

(Other definitions for grout that I've seen before include "plaster" , "Thin mortar for filling building joints etc" , "Thin mortar for filling cracks" , "Fill the cracks" , "Tile mortar" .)

I've seen this clue in the LA Times.

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.