Possible Clues:

• Cell's '3' letters
• — Leppard (rock band)
• Phone letters next to 3
• ___ Leppard (band with a one-armed drummer)
• It's looked up in a dict
• Surely, informally
• Word before Leppard or Jam
• Excellent, in 1980s slang
• Latter-day ''neato''
• Dict. snippet