Possible Clues:

• In A to Z order
• For calling names it's how the letters are delivered
• Top man back in charge with gangster provides a way of naming names in order
• A patch liable to emerge from this feature of first floor letters
• Boy precedes girl; man, woman: it's in order
• Begins to show such order
• One kind of order
• Like the order of the letters in the first words of the starred entries, before being shaken up
• Related to 26 characters
• How first letters appear, for example