Goinsane

2 clues
Lose your marbles
Lose one's marbles
Similar answers:
Agoing
Aladdinsane
Amishgoingcrazy
Aregoing
Asaneel
Asanendinitself
Asbaldasaneagle
Batsaneye
Batsaneyelash
Blackflagunsane
Butimustbegoing
Bynotgoingin
Cargoingup
Castsaneye
Comingorgoing
Driveinsane
Easygoing
Eyesoftheinsane
Fargoing
Forgoing