Stumped on ‘Smooth Out’ Crossword?

The crossword clue “smooth out” refers to the action of making something flat or even, and the answer is “iron.” When you iron clothes, you use a hot metal tool to press down on the fabric and remove any wrinkles or creases, leaving the surface smooth and even. Therefore, the answer “iron” fits the clue “smooth out” perfectly as it refers to the action of making something smooth and flat just like ironing clothes.