Possible Clues:

• 25 Across, for one
• AOL or Comcast, for short
• Cox, e.g.
• Juno or NetZero, for short
• NetZero, for ex.
• Online-access co
• Comcast or AOL, for example: Abbr
• AOL, for many
• AOL or MSN, e.g
• Access/address co