Turned and twisted overmuch (9)
I believe the answer is:
redundant
'overmuch' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'turned and twisted' is the wordplay.
'twisted' is an anagram indicator.
'turned'+'and'='turnedand'
'turnedand' is an anagram of 'REDUNDANT'.
Can you help me to learn more?
(Other definitions for redundant that I've seen before include "out of a job" , "Superfluous to requirements" , "No longer required, unnecessary" , "no longer wanted" , "No longer necessary" .)