Possible Clues:

• Some finish at the front, given power injection course
• Quietly invested in some poor course
• One downs the salts (5)
• Town in Portugal around which some got lost
• Derby race track
• Mopes about in town
• Salts' place - in the deep, somewhere
• One salts them and downs them
• Vodafone Derby site
• Course creep's omitted? Not altogether