Smoothed peaks, perhaps, of an unsound mind (8)
I believe the answer is:
deranged
'smoothed' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?
'peaks perhaps of an unsound mind' is the wordplay.
I cannot quite understand how this works, but
'peaks' could be 'range' (mountain range) and 'range' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for deranged that I've seen before include "irrational" , "Mentally unbalanced" , "Crackpot" , "What Ophelia was eventually" , "Lunatic" .)