I have had a pair of clowns in my display that started laying eggs about 4 months ago, and they have continued to lay eggs on a very regular basis. Always in the same spot. It is very cool. If you want to try to hatch and raise the fry, do go read as much as you can about the process.
Unfortunately, my clowns picked a large rock as "the spot" for their nest, and I can't remove it from the DT. This makes it tricky to get the eggs out, and since my DT is 220 gals and has lots of fish in it, I need to get the eggs out to have any chance at rearing the fry. My only hope is to have the female lay the eggs on something else that I can easily remove. I've tried putting tiles, rocks, other things in the spot where they nest, but each time, they manage to push/pull/otherwise move the thing out of the way. They are way more creative at this than I ever imagined. It is a game at this point, and I will eventually win, but I am being cautious because I don't want to mess up the routine they have been sticking to.
So, my advice to you is to carefully watch where they are targeting for nest, and see if you can figure out a way to be sure you can remove the eggs once they are laid. People who do this for the purposes of breeding use flower pots or other objects in dedicated tanks and the clowns cooperate. When it's a DT, it take a bit more due diligence ...