Related Clues:

• Frequent English football score
• Morse's creation
• Convert to dots and dashes
• Make hard to figure out
• What a spy may write in
• Nothing that plays a prominent role in this puzzle
• Program lines
• Zero, on some scorecards
• Java ingredient?
• Do some espionage work
• Nonentity
• Something to crack
• Celsius ice point
• Scoreless score
• Set of rules