Answer: atitagain

AnswerCrossword Clue
ATITAGAINQuarreling once more
ATITAGAINLike political foes, frequently
ATITAGAINBack to bickering
ATITAGAINBack to one's old tricks
ATITAGAINUp to more mischief
ATITAGAINStirring up more trouble
ATITAGAINUp to one's old tricks
ATITAGAINBickering once more
ATITAGAIN". . . up to his old tricks"