Left angry deejay playing Queen (4,4,4)
I believe the answer is:
lady jane grey
'queen' is the definition.
(I know that Lady Jane Grey is a monarch of England)
'left angry deejay playing' is the wordplay.
'left' becomes 'l' (common abbreviation).
'playing' indicates an anagram.
'angry'+'deejay'='angrydeejay'
'angrydeejay' with letters rearranged gives 'adyjanegrey'.
'l'+'adyjanegrey'='LADY JANE GREY'
(Other definitions for lady jane grey that I've seen before include "The Nine Day Queen, executed 1554" , "Queen for ten days" , "Nine-day queen" , "The ten day queen" , "Queen for nine days" .)