Incapacitated (8)
I believe the answer is:
helpless
'incapacitated' is the definition.
(I know that incapacitated can be written as helpless)
This is the entire clue.
(Other definitions for helpless that I've seen before include "Unable to manage, dependent on others" , "Unaided" , "Unable to manage independently" , "Unable to do things for oneself" , "Unable to cope, without resources" .)