Answer: smilesmilesmile

AnswerCrossword Clue
SMILESMILESMILELyricist Asaf's advice in a 1915 song
SMILESMILESMILEAdvice in a 1915 song
SMILESMILESMILEDON'T look so sad!
SMILESMILESMILE"Pack Up Your Troubles" suggestion