Crossword Genius

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

Ross

I believe the answer is:

logarithm

I'm a little stuck... Click here to teach me more about this clue!

'napier's' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'function to record a beat do we hear?' is the wordplay.
I cannot quite understand how this works, but
'record' could be 'log' (logging is a kind of recording) and 'log' is located in the answer.
'a' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for logarithm that I've seen before include "Exponent" , "Power to which base number must be raised to obtain a given number" , "Aid to mathematical calculation" , "It undoes power" , "Mathematical aid simplifying multiplication and division - a girl moth (anag)" .)

I've seen this clue in The Times.
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