Lack of care (7)
I believe the answer is:
neglect
'lack of care' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for neglect that I've seen before include "Fail to attend to properly, task or person" , "Insufficiently attend to" , "Failure to show care" , "lack of concern?" , "Fail to give attention to" .)