Declare a test to be rigged (5)
I believe the answer is:
state
'declare' is the definition.
(I know that declare is a kind of state)
'a test to be rigged' is the wordplay.
'to be rigged' indicates anagramming the letters.
'a'+'test'='atest'
'atest' anagrammed gives 'STATE'.
(Other definitions for state that I've seen before include "See 18" , "Declare; affirm" , "Part of America" , "Claim" , "Georgia < or Virginia" .)