What does the cryptic crossword clue "Hole up in sound mattress (3,3)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Hole up in sound mattress (3,3)

Guardian Cryptic #29786 | 26 Down | 2025-08-29 flower

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