"Won't Get Fooled Again" rockers (3,3)
I believe the answer is:
the who
'won't get fooled again rockers' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for the who that I've seen before include "questionable identity?" , "Pop group (Tommy, Quadrophenia)" , "Rock group (Tommy, My Generation)" , "British pop group" , "60s rock group" .)