Related Clues:

• Aboard main vehicle, not out to get into pickle making mischief
• Improper behaviour the concern of a drill, perhaps?
• Carry-on regarding main form of transport getting stuck in tunnel — extremely serious
• Mischievousness
• From team on key bus, inessential bad behaviour
• Dubious activity of male working with important firm
• Misbehaviour of king in banking, for example
• *Tomfoolery
• Hanky-panky king breaking bank, say?
• Brother setting up the old firm in sharp practice
• Deceitful conduct of male running major concern
• Chicanery a concern for primates?
• Mischief from crook finally breaking into bank, say?