"I don't care" attitude (6)
I believe the answer is:
apathy
'i don't care attitude' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for apathy that I've seen before include "Lack of emotion and interest" , "Complete lack of interest, indifference" , "Lack of emotion and enthusiasm" , "Detachment" , "State of listlessness or disinterest" .)