Tee-___ (giggle)

HEE

Think of the sound you might make when laughing lightly after "tee."

The clue "Tee-___ (giggle)" hints at the sound of laughter, where "tee" is the start of a common giggle. The answer "HEE" completes the phrase "tee-hee," which is a playful way to represent laughter. This is a straightforward fill-in-the-blank clue based on a familiar expression.