Crossword Genius

Next clue needs this for a diarist's age (5,8)

Ross

I believe the answer is:

three quarters

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If this is the answer, I'm afraid I cannot explain it.

Can you help me to learn more?

(Other definitions for three quarters that I've seen before include "Nine out of twelve" , "75%" , "Backs" .)

I've seen this clue in The Guardian.
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