Possible Clues:

• One guides part of what's heard, by the sound of it
• Is 17 down or at the 20 down
• Beasts on board with the rudder
• Beefy guides?
• Works at the wheel in such a beastly way
• Directs cattle
• Puts about again in turn when one takes the helm
• Is a tiller nothing to do with gee-gees?
• Has the tiller
• Cowboy charges