Possible Clues:

• Person who deliberately causes damage
• Cultural destroyer
• Destructive type in London museum left
• Teh Victoria and Albert Museum initially gets fifty from the one that did the damage
• Val literally a hooligan!
• Museum student is a delinquent
• Defacer
• One wrecking vehicle young chap's driven up
• Hooligan caught by CCTV and alarm
• Member of a Germanic people who ravaged Rome in 455