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One going into a number as a loud performer (6)

Ross

I believe the answer is:

factor

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'one going into a number' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'a loud performer' is the wordplay.
'a loud' becomes 'f' (A musical term).
'performer' becomes 'actor' (actor is a kind of performer).
'f'+'actor'='FACTOR'

'as' acts as a link.

Can you help me to learn more?

(Other definitions for factor that I've seen before include "Of 15, 3 or 5" , "Scottish estate manager" , "Thirteen is one of fifty two" , "Aspect" , "Contributing element" .)

I've seen this clue in The Telegraph.
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