Calm

HUSH

A quieting sound often whispered to soothe a restless child at night.

"Calm" hints at quietness, and "hush" is a simple word meaning to be silent or still. The clue plays on the idea of creating calm by reducing noise, making "hush" a direct fit. It’s also a gentle command you might use to soothe someone, reinforcing the peaceful tone. No tricks here—just a straightforward match between the clue and answer.