(& 21-across) Stop being sluggish and refresh oneself (4,4,3,7 ...

A close-up of a person's face, with a puzzled expression, as they look at a crossword puzzle. The background is a blurred image of a cityscape at night, with a few streetlights visible. The person's eyes are narrowed, and their brow is furrowed, as if they are deeply concentrated on the puzzle. The image captures a moment of intense focus and determination.