"Mine," repeatedly claims songwriter (6)
I believe the answer is:
eminem
'songwriter' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'mine repeatedly claims' is the wordplay.
'mine repeatedly' can mean three substitutions for 'mine'.
'claims' indicates a hidden word (the answer is held or claimed within the clue).
'EMINEM' is hidden in the letters of 'mine mine mine'.
Can you help me to learn more?
(Other definitions for eminem that I've seen before include "US rapper" , "Rap artist" .)