Crossword Genius

Whisper main number of forty-five? (5)

Ross

I believe the answer is:

aside

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'whisper' is the definition.

I cannot understand how the remainder of the clue works.

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(Other definitions for aside that I've seen before include "Apart; incidental remark" , "Separately" , "Remark by an actor, directly to audience say" , "Whispered comment" , "In reserve; actor's remark to audience" .)

I've seen this clue in The Independent.
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