Ghostly rubbish bin is evil (9)
I believe the answer is:
invisible
'ghostly' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?
'rubbish bin is evil' is the wordplay.
'rubbish' indicates an anagram (a poor quality or rubbish spelling of the letters).
'bin'+'is'+'evil'='binisevil'
'binisevil' with letters rearranged gives 'INVISIBLE'.
Can you help me to learn more?
(Other definitions for invisible that I've seen before include "Imperceptible by the eye" , "Impossible to see" , "Blind" , "Out of sight" , "Hidden - imperceptible" .)