Vandalism got a base destroyed (8)
I believe the answer is:
sabotage
'vandalism' is the definition.
(I've seen this before)
'got a base destroyed' is the wordplay.
'destroyed' indicates an anagram.
'got'+'a'+'base'='gotabase'
'gotabase' anagrammed gives 'SABOTAGE'.
(Other definitions for sabotage that I've seen before include "Treachery!" , "Subvert" , "enemy action" , "Disrupt" , "spoil things" .)