Old rockers following used to be dissipated (6)
I believe the answer is:
wasted
'dissipated' is the definition.
(I've seen this before)
'old rockers following used to be' is the wordplay.
'old rockers' becomes 'ted' (I can't explain this - if you can you should believe this answer much more).
'following' is a charade indicator (letters next to each other).
'used to be' becomes 'was' (I've seen this before).
'ted' put after 'was' is 'WASTED'.
Can you help me to learn more?
(Other definitions for wasted that I've seen before include "Having lost weight through illness - dissipated?" , "Drunk (as a missed opportunity?)" , "Blown" , "Used up needlessly or weakened through illness" , "Misspent" .)