Shannon Tweed? (6)
I believe the answer is:
rivers
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for rivers that I've seen before include "''Only Our ... Run Free'' (MacConnell ballad)" , "Thames and Hudson?" , "Large natural streams of water" , "Comedienne Joan" , "''Only Our ... Run Free'' (McConnell ballad)" .)