Harshly critical (8)
(Other definitions for censorious that I've seen before include "Severely critical" , "making moral judgments?" , "Fault-finding" , "Blaming" .)
'harshly critical' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for scathing that I've seen before include "Acid" , "Harshly critical" , "Severely critical" , "Painful" , "Scornfully critical" .)