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.
However, I'm not sure 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)'" .)