Rules the singer breaks (6)
I believe the answer is:
reigns
'rules' is the definition.
(reign can mean to rule or govern)
'singer breaks' is the wordplay.
'breaks' indicates anagramming the letters.
'singer' is an anagram of 'REIGNS'.
'the' is the link.
(Other definitions for reigns that I've seen before include "Obtains" , "Holds sway" , "Rules over, occupies throne" , "Rules as sovereign" , "Lords it over singer" .)