Sprinkles on, e.g.

The crossword question is asking for a word that means “sprinkles on“, with the example given being “wets“. In this context, “wets” most likely refers to the act of pouring liquid onto something, causing it to become wet or moist. This could be a cooking technique, such as adding a sauce or broth to a dish, or it could be used to describe a rainy day where the ground and plants become wet from the raindrops. Essentially, the word “wets” is being used as a verb to describe the act of adding moisture to something.