Related Clues:

• Screen-measuring unit
• About 1/39,000 of a kilometer
• Go slowly (along)
• Yardstick division
• Worm's unit?
• Take tiny steps
• Division on a 5-Down
• Stubborn people won't give one
• Worm size
• 1/12 of a foot
• Unit indicated by '
• Move very slowly
• Advance at a snail's pace
• Part of a foot?
• What a stalwart won't give?