Less than fifty per cent from all-rounder (5)
I believe the answer is:
under
'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)'" .)