Vowelless attention-getter

PSST

Think of the quiet sound you’d make to secretly get someone’s attention without saying a word.

This clue plays on the idea of an "attention-getter," which is a sound or word used to quietly grab someone’s notice—like "psst." The word "vowelless" hints that the answer contains no vowels (A, E, I, O, U), and "psst" fits perfectly since it’s spelled without any. It’s a clever way to combine the meaning of the phrase with a literal spelling constraint.