Crossword Genius

Less than fifty per cent from all-rounder (5)

Ross

I believe the answer is:

under

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'less than' is the definition.
(eg under a certain number)

'fifty per cent from all-rounder' is the wordplay.
'UNDER' is hidden within the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for under that I've seen before include "Beneath or subordinate to" , "Governed by" , "Lower than" , "See 16 Down" , "'Beneath, below (5)'" .)

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