Possible Clues:

• Vague objectives lead to unfinished business
• They're often tied up with unfinished business
• Unfinished business could mean someone will trip up?
• Unfinished business, or, in a way, what 17-, 27- and 47-Across have in common
• Unsettled details
• Things that should be tied up by the curtain?
• They are free finally, but should still be tied up
• Fraying result, and what the second parts of the starred answers can be
• Final details to take care of ... and, literally, what the last words of 20-Across and 10- and 29-Down can be
• Unfinished business in toilet — how Elvis begins to die in smalls