Author Vidal (4)
I believe the answer is:
gore
'author vidal' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for gore that I've seen before include "Result of bleeding" , "Coagulated blood from a wound" , "Poetic blood from Al?" , "Spilt blood" , "it's a queasy sight" .)