Parents, for example, upset by vandalism (6)

I believe the answer is:

damage

I'm a little stuck... Click here to teach me more about this clue!

'vandalism' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for damage that I've seen before include "Harm, impair" , "Cost (slang)" , "Harm, injury" , "Ravages" , "vandalism?" .)

I've seen this clue in the Irish Times (Crosaire) and The Irish Times.

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