Clue: Disk add-on?

Answer: ETTE

Length: 4

---

Similar Clues:

• Online address (URL with 3 letters)
• Villainous laugh added to Oxford Dictionaries Online in 2012 (MWAHAHAHA with 9 letters)
• Online addresses (IPS with 3 letters)
• Ontario address (e.g. BURFORD with 7 letters)
• Online address start (HTTP with 4 letters)
• Address online, for short (URL with 3 letters)
• Address found online (URL with 3 letters)
• Often implied letters in an online address (HTTP with 4 letters)
• Online address, familiarly (URL with 3 letters)
• Student's online address letters (EDU with 3 letters)