Diabolical cur: damnable one made to support the wicked? (11)
I believe the answer is:
candelabrum
'one made to support the wicked?' is the definition.
(a candelabrum supports candles - things with wicks)
'diabolical cur damnable' is the wordplay.
'diabolical' is an anagram indicator.
'cur'+'damnable'='curdamnable'
'curdamnable' anagrammed gives 'CANDELABRUM'.
(Other definitions for candelabrum that I've seen before include "should be left hanging from the ceiling!" , "Source of light when lit" , "Light accompaniment to" , "Holder for several lights" , "lamp holder" .)