Crossword Genius

Half of a fraction? (9)

Ross

I believe the answer is:

numerator

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This clue could be a double definition.

'half' is the first definition.
The answer and definition can be both quantities as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'a fraction?' is the second definition.
The definition and answer can be both quantities as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'of' acts as a link.

Can you help me to learn more?

(Other definitions for numerator that I've seen before include "Upper half of fraction" , "quantity of parts?" , "One counts" , "Upper figure in a fraction" , "Figure going over a line" .)

I've seen this clue in the Sydney Morning Herald.
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