Rocker's opponent with rodents returning wanting fame (7)
I believe the answer is:
stardom
'fame' is the definition.
(I've seen this in another clue)
'rocker's opponent with rodents returning' is the wordplay.
'rocker's opponent' becomes 'dom' (I am not sure about this - if you are sure you should believe this answer much more).
'with' means one lot of letters go next to another.
'rodents' becomes 'rats' (rat is a kind of rodent).
'returning' says the letters should be written in reverse.
'rats' written backwards gives 'star'.
'dom' put after 'star' is 'STARDOM'.
'wanting' acts as a link.
Can you help me to learn more?
(Other definitions for stardom that I've seen before include "(The prestige of) celebrity" , "Celebrity status" , "Great celebrity" , "Status of a top actor" , "Great fame" .)