The term 'be responsible for' can be broken down into three crossword solutions: CAUSE (5 letters), TEND (4 letters), and seeto (5 letters). To be responsible for something means to be accountable for it, and these three words provide insight into what that entails. To CAUSE something is to bring it about, to TEND to something is to take care of it, and to seeto something is to make sure it is done. Together, these three words suggest that being responsible for something involves initiating it, taking care of it, and ensuring it is completed.