What does the cryptic crossword clue "Sound around shape initially absent in hypothetical tunnel (8)" mean?

The definition is "hypothetical tunnel". The wordplay uses a deletion. ORM (synonym="ORM") in WHOLE (synonym="WHOLE") = WORMHOLE; definition: "hypothetical tunnel" The answer is WORMHOLE.

Sound around shape initially absent in hypothetical tunnel (8)

Guardian Cryptic #28134 | 4 Down | 2020-05-15 flower

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