What does the cryptic crossword clue "OneNote audio input extension (7)" mean?

The definition is "input extension". The wordplay uses a homophone (sounds like). AN (synonym="‘one’") + TENNA (synonym="TENNA") = ANTENNA; definition: "input extension" The answer is ANTENNA.

OneNote audio input extension (7)

Guardian Cryptic #28952 | 20 Across | 2022-12-28 flower

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