Related Clues:

• Not steady enough to let the gee-gee out, perhaps
• Not the steady way to let the horse out, perhaps
• It's a bit mad to let the horse out
• You'd be dotty to let the horse out like this
• One in France has a horse there for one that's a 10 across
• Not the regular thing to do wrong with a twitch
• Er lumber room sounds not a regular place
• Unstable enough to make a mistake at one hundred
• Wavering, the French follow the United Nations' bill
• Prone to violence
• Not even little by little, a traitor infiltrated
• Met up for a final word on chess champ that's moody
• A town deprived of its head is likely to collapse
• Capricious boy about to betray one's trust
• Wayward vermin found in Morecambe?