Incorrect, false (6)
I believe the answer is:
untrue
I believe this is a double definition.
'incorrect' is the first definition.
(I've seen this in another clue)
'false' is the second definition.
(I know that false can be written as untrue)
(Other definitions for untrue that I've seen before include "Not in accordance with the facts" , "Not correct, like a lie" , "Not faithful" , "apocryphal" , "False or crooked" .)