False or incorrect (6)
I believe the answer is:
untrue
I believe this clue is a double definition.
'false' is the first definition.
(I know that false can be written as untrue)
'incorrect' is the second definition.
(I've seen this in another clue)
(Other definitions for untrue that I've seen before include "Not in accordance with fact" , "Wrong" , "like the magnetic north?" , "Not faithful" , "Spurious" .)