Possible Clues:

• Make one's mind up
• River police invited in to settle the issue
• Go one way or the other
• Resolve of old Spanish leader to cross river
• Resolve or give a judgment
• What fans do in a readers' poll
• Resolve unfinished plan by end of year
• Determine what comes after the seaside, it sounds like?
• Police in river to reach conclusion
• Criminal Investigation Department filling most of legal document for judge