Possible Clues:

• The way one hurried back with the rat, or that would be telling
• Ran up over the rat, or did it in a telling way
• Commentator arrived in international organisation at a run
• Part in many a documentary
• He tells of island rising to rocky height
• Person who spins yarns
• The one telling the story - arrant or what?
• Rant and roar, upset by reporter
• Ran back over the pest, or 9 across it
• A sort of 5 down, and thereby hangs a tale