Blooming popular record covered by Muse (2,3,4)
I believe the answer is:
in the pink
'muse' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'blooming popular record covered by' is the wordplay.
'blooming popular record' becomes 'thepink' (I can't justify this - if you can you should believe this answer much more).
'covered' becomes 'in' (I've seen this in other clues).
'by' is a charade indicator (letters next to each other).
'thepink' after 'in' is 'IN THE PINK'.
Can you help me to learn more?
(Other definitions for in the pink that I've seen before include "How Britain's colonies appeared on maps" , "Enjoying perfect health" , "Perfectly healthy" , "Thirteen [IN GOOD NICK]" , "Informally in good health, even roseate" .)