Possible Clues:

• ''Spring forward'' letters
• "Spring ahead" letters
• "Spring ahead" abbr.
• AZ doesn't observe it
• Clock setting: abbr.
• ''Spring forward'' clock setting: Abbr
• Summer hours: Abbr
• Most of Ariz. doesn't observe it
• What Ariz. and Hawaii are the only two states not to have
• It ends in the fall: Abbr.