Ineffectual, irresponsible (8)
I believe the answer is:
feckless
I believe this is a double definition.
'ineffectual' is the first definition.
(I've seen this before)
'irresponsible' is the second definition.
(similar in meaning)
(Other definitions for feckless that I've seen before include "Incompetent and ineffectual" , "Weak - irresponsible" , "Incompetent and irresponsible" , "Irresponsible (with money)" , "Incompetent, feeble" .)