Declared, asserted (6)
I believe the answer is:
stated
I believe this clue is a double definition.
'declared' is the first definition.
(I know that declared can be written as stated)
'asserted' is the second definition.
(I've seen this before)
(Other definitions for stated that I've seen before include "Declared or asserted" , "Said firmly, averred" , "Declared as fact" , "Expressed, detailed" , "Uttered, expressed in words" .)