Surplus sound of rock group? (2,6)
I believe the answer is:
in excess
'sound of rock group?' is the definition.
Both the answer and definition are adverbs. Perhaps there's a link between them I don't understand?
'surplus' is the wordplay.
I cannot really understand how this works, but
'surplus' could be 'excess' (synonyms) and 'excess' is found in the answer.
The remaining letters 'in' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for in excess that I've seen is " Over the top".)