Assert, declare (5)
I believe the answer is:
state
This clue is a double definition.
'assert' is the first definition.
(I've seen this in another clue)
'declare' is the second definition.
(I know that state is a type of advise)
(Other definitions for state that I've seen before include "Express; pomp" , "Claim" , "Public" , "Declare - political unit" , "Condition of country." .)