Declare to be in bad taste (5)
I believe the answer is:
state
'declare' is the definition.
(I know that state is a type of advise)
'bad taste' is the wordplay.
'bad' indicates anagramming the letters.
'taste' anagrammed gives 'STATE'.
'to be in' acts as a link.
(Other definitions for state that I've seen before include "For example, New York or Washington but not Boston or Philadelphia" , "Condition; nation" , "Assert; nation" , "E.g. Georgia" , "Georgia < or Virginia" .)