Vandalism may be wonderful (8)

I believe the answer is:

smashing

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'be wonderful' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for smashing that I've seen before include "Such destructive behaviour" , "use for plates at a Greek wedding?" , "2 [COOL] or 3 [DANDY] perhaps, possibly 20d [WICKED] or 22 [GEAR] !" , "Wonderful" , "Fantastic" .)

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