Faulty CD — it isn't clear (8)
I believe the answer is:
distinct
'clear' is the definition.
(similar in meaning)
'faulty cd it isn't' is the wordplay.
'faulty' is an anagram indicator.
'cd'+'it'+'isnt'='cditisnt'
'cditisnt' is an anagram of 'DISTINCT'.
(Other definitions for distinct that I've seen before include "Plain" , "Definite and unmistakeable" , "Clearly outlined and easy to see" , "Recognisably different" , "Definite or different in kind" .)