Possible Clues:

• Charge for use of cattle enclosure by length?
• Back's gain
• The measure of how old three feet might be
• Distance in golf
• Years on a road - a good source of energy needed for this distance
• Charge for using enclosure three foot ahead of time
• It really counts for golfers
• Gay dear (anag.)
• Measure vehicle over a period of time
• The cart came back before time when measured this way