Possible Clues:

• Where golf pro may be providing lessons?
• Route of the race
• Venue for race or golf tournament
• You say the rough is something golfers are familiar with
• Naturally, it's of this that you'd swear it's about nothing
• Naturally it's of this for the race
• Way to sound crude
• Naturally of this there's nothing in swearing
• "Of ---" (certainly)
• Route; dish