Related Clues:

• Cowboy's goading instrument
• Sharply pointed projection
• Secondary railroad line
• Cowboy's boot spike
• Goad, cowboy-style
• Horseshoe gives encouragement
• Tim Duncan, for his whole career
• Pony prodder
• Goad — incentive
• Exhorting
• Attachment for cowboy boots
• Impeller
• Sidetrack?
• Pleading, as you are, with soldier is no good
• Nudge — it's about a Greek letter — first letter to the Guardian