Possible Clues:

• The first (but not the fourth) letter in "circle"
• Cinematic opening, but not ending?
• The first letter of "cent," e.g.
• Centaur's head?
• 'Cell' starts with one
• Ceylon's capital?
• Civil beginning?
• The first letter of 'circle' (but not the fourth)
• Beginning of cellulite?
• Feature of cement but not concrete?