John who sang "Bennie and the Jets" (5)
I believe the answer is:
elton
'john who sang bennie and the jets' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elton that I've seen before include ". . . . . John (musician)" , "Sir - - John, singer songwriter" , "One John" , "Ben --; -- John" , "Sir ___ John, singer-songwriter" .)