Related Clues:

• With 3 Down, Certs alternative
• Thoughtless action?
• Idiosyncratic quirk
• Start of a simple game name
• Sudden reaction
• Sign of anxiety, perhaps
• Spasm geneticist conceals
• First "O" in a game
• The 'R' of 33-Down
• First of three X's
• ___ Tacs
• First syllable of a kids' menu game
• Word one of three involving X's and O's
• Twitch irregularly — or regularly — with this
• Bit of a jerk