Rock group turned popular with artist covering lead position (7)
I believe the answer is:
nirvana
'rock group' is the definition.
'Nirvana' can be an answer for 'group' (US musical group). I'm unsure of the 'rock' bit.
'turned popular with artist covering lead position' is the wordplay.
'turned' shows that the letters should be reversed in order.
'popular with' becomes 'in' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'covering' is an insertion indicator.
'lead position' becomes 'van'.
'in' written backwards gives 'ni'.
'ra' enclosing 'van' is 'rvana'.
'ni'+'rvana'='NIRVANA'
Can you help me to learn more?
(Other definitions for nirvana that I've seen before include "The Buddhist's version of Paradise" , "Buddhist enlightened state" , "US rock band" , "Ultimate state in Buddhism" , "Buddhist state of bliss; enlightenment" .)