Churchill's "categorical inexactitude" (4)
I believe the answer is:
lies
'churchill's categorical inexactitude' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lies that I've seen before include "Assumes a horizontal position" , "Untruths" , "Wallows" , "Terminological inexactitudes" , "pork pies" .)