Answer: tic

AnswerCrossword Clue
TICFirst O, say
TICNervous twitch
TICIt can't be helped
TICFoible
TICHalf a mint
TICSign of nerves, perhaps
TICFirst X or O
TICSmall spasmodic reaction
TICBad liar's giveaway
TICContraction of a sort
TICStart of a simple game
TICRepetitive throat-clearing, e.g.
TICFirst X, say
TICMannerism
TICMuscular twitch
TICNervous reaction
TICInvoluntary movement
TICInvoluntary sign of nerves
TICPoker table tell, maybe
TIC...-tac-toe
tica twitch / to twitch
TICTwitching
TICTwitch
TICQuirk
TICAnnoying facial movement
TICHalf a miniature mint?
TICJitter
TICCan be facial
TICMuscle spasm
TICMuscular contraction
TICPersonal quirk
TICSpasm
TICFirst X?
TICQuirky habit
TICMannerism or spasm
TICNervous mannerism
TICIdiosyncrasy
TICOdd mannerism
TICPersonality quirk
TICBehavioral oddity