Harrison who acted, reportedly, in ruins (6)
I believe the answer is:
wrecks
'ruins' is the definition.
(wrecking is a kind of ruining)
I don't understand the remainder of the clue.
(Other definitions for wrecks that I've seen before include "ruins" , "suffers ruin" , "Ships at bottom of ocean" , "Ships destroyed at sea" , "Ships at bottom of sea" .)