Rock group going downhill? (7,6)
I believe the answer is:
rolling stones
'rock group' is the definition.
'going downhill?' is the wordplay.
I cannot really see how this works, but
'going' could be 'rolling' (rolling is a kind of going) and 'rolling' is found in the answer.
The remaining letters 'stones' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rolling stones that I've seen before include "Revolving pebbles" , "Old rockers" , "Group (without moss?)" .)