Accountable (11)
'accountable' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for responsible that I've seen before include "Answerable (for something)" , "Having obligations" , "Morally accountable for one's behaviour" , "To blame" , "Answerable; trustworthy" .)
'accountable' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for liable that I've seen before include "'Responsible, answerable (6)'" , "Legally answerable" , "Subject to an obligation" , "To blame" , "Apt to" .)