Possible Clues:

• Involved in forming a new date-line
• 'With something long behind, perhaps, for succession (8)'
• Hospital department needed a doctor, so called for
• Involved hospital department and suffered
• As inheritance, limited by invalid dateline
• Unavoidably involved dog in terrible need
• Involved only half of talent, and suffered
• Caused upset on hospital department
• Needed hospital facility, wasn't well
• Made necessary by date-line