Records broken by Ernest (6)
I believe the answer is:
enters
'records' is the definition.
(enter can mean to enter into a record)
'broken by ernest' is the wordplay.
'broken by' indicates anagramming the letters (a broken form of the letters).
'ernest' with letters rearranged gives 'ENTERS'.
(Other definitions for enters that I've seen before include "Registers for a competition, say" , "Goes inside" , "Goes in or records in book" , "Inserts" , "Records, in a diary say" .)