Doughnut-Shaped Breakfast Cereal (one Piece)
Puzzle 16 of Tolkien Universe Medium Pack
Question is: Doughnut-Shaped Breakfast Cereal (one Piece)
and the answer is: CHEERIO
Word Meaning:
CHEERIO — (UK, Ireland, Commonwealth, informal) Goodbye, an interjection said upon parting.
Definitions from Wiktionary.