Really mean it's as CID arranged? (8)
I believe the answer is:
sadistic
'really mean' is the definition.
(I've seen this in another clue)
'it's as cid arranged?' is the wordplay.
'arranged?' indicates anagramming the letters.
'its'+'as'+'cid'='itsascid'
'itsascid' is an anagram of 'SADISTIC'.
(Other definitions for sadistic that I've seen before include "Enjoying others' pain" , "Liking to inflict pain on others" , "Liking to hurt others" , "Loving cruelty" , "Gaining pleasure from inflicting pain" .)