Possible Clues:

• First letter (of name)
• Part of J.F.K.?
• Sign one letter
• First letter of a name
• At first it's in it to start with
• At first it starts inside it to ail at last
• Let 'er come first, by the sound of it
• Hanky embroidery
• Primary part of a monogram
• Comes first in one twisted tail at last