Singer against “The King of Pop" singles (3,5)
I believe the answer is:
tom jones
'singer' is the definition.
(I've seen this before)
'against the king of pop singles' is the wordplay.
'against' becomes 'to' (as in a lean-to, building leaning against anothe).
'the king of pop' becomes 'mj' (I can't explain this - if you can you should give a lot more credence to this answer).
'singles' becomes 'ones' ('one' can be a synonym of 'single').
'to'+'mj'+'ones'='TOM JONES'
Can you help me to learn more?
(Other definitions for tom jones that I've seen before include "1749 Henry Fielding novel" , "Book" , "Henry Fielding novel; singer" , "film" , "Welsh singer - Fielding hero" .)