Elevated works building maliciously ruined (7)
I believe the answer is:
trashed
'maliciously ruined' is the definition.
(to trash is to destroy)
'elevated works building' is the wordplay.
'elevated' is a reversal indicator (in a down clue, letters go up).
'works' becomes 'art' (I've seen this before).
'building' becomes 'shed' (shed is a kind of building).
'art' in reverse letter order is 'tra'.
'tra'+'shed'='TRASHED'
(Other definitions for trashed that I've seen before include "Criticised" , "Destroyed" , "Vandalised" , "completely taken apart" .)