Declare categorically (6)
I believe the answer is:
assert
(Other definitions for assert that I've seen before include "State firmly or vigorously" , "State firmly, aver" , "Aver, declare" , "Insist upon (rights etc)" , "protest" .)
I believe the answer is:
assert
(Other definitions for assert that I've seen before include "State firmly or vigorously" , "State firmly, aver" , "Aver, declare" , "Insist upon (rights etc)" , "protest" .)