What does the cryptic crossword clue "Napier's function, to record a beat, do we hear? (9)" mean?

The definition is "Napier’s function". The wordplay uses a homophone (sounds like). LOG (record), A, RITHM sounds like [do we hear] “rhythm” (beat). And for once I remembered who Napier was. The answer is LOGARITHM.

Napier's function, to record a beat, do we hear? (9)

Times Cryptic #28760 | 13 Across | 2023-11-14 flower

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