Possible Clues:

• Damager of London museum going on trial at last
• Despoiler
• Destructive type in museum then left
• Fall quaff
• Old German museum, large
• One wrecking vehicle boy reversed
• Person who puts the writing on the wall, e.g
• Destructive lout beginning to lurk behind London museum
• Member of an east Germanic tribe which established kingdoms in the Iberian peninsula
• One who causes wilful damage to property