Lifeguard’s Shrill Instrument That Is Blown
Puzzle 16 of Tools of the Trade Easy Pack
Question is: Lifeguard’s Shrill Instrument That Is Blown
and the answer is: WHISTLE
Word Meaning:
WHISTLE — A device designed to be placed in the mouth and blown, or driven by steam or some other mechanism, to make a whistling sound.
Definitions from Wiktionary.