Circle above an angel's head

HALO

4-letter answer

The clue describes a "circle above an angel's head," which is a common visual symbol in art and religion. A halo is the glowing ring often depicted floating over the heads of angels, saints, or holy figures to represent their divine or sacred nature. The wordplay is straightforward—no tricks here—just a direct reference to the well-known image. If you’ve ever seen a painting of an angel, you’ve likely noticed the bright circle hovering above them.