Clues across 3 Not to be able to find something. 5 Definitely, no doubt, surely. 6 Something that you wear to hide yourself or change the way you look.

Based on the clues provided, here are the answers: 1. Clue: "Not to be able to find something." (3 letters) Answer: **"Lose"** 2. Clue: "Definitely, no doubt, surely." (5 letters) Answer: **"Certa"** (though this is more commonly "Sure" for 4 letters; "There" doesn't fit either) 3. Clue: "Something that you wear to hide yourself or change the way you look." (6 letters) Answer: **"Masker"** (for something like a mask) So you could check "mask" and "sure" for the respective hints. If you're looking for something more specific or clarifications, feel free to ask!