Starts to beat everyone in organised match play (7)
I believe the answer is:
macbeth
'play' is the definition.
(Shakespeare play)
'starts to beat everyone in organised match' is the wordplay.
'starts to' indicates taking the first letters.
'in' is an insertion indicator.
'organised' indicates an anagram.
The first letters of 'beat everyone' is 'be'.
'match' with letters rearranged gives 'macth'.
'be' inserted inside 'macth' is 'MACBETH'.
(Other definitions for macbeth that I've seen before include "piece" , "Shakespearean play" , "Shakespearean tragedy" , "Shakespears's Scottish play" , "Shakespeare's Scottish play, considered unlucky" .)