State without proof (6)
I believe the answer is:
allege
'state without proof' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for allege that I've seen before include "Accuse without established proof" , "Aver (without proof)" , "Declare without being able to prove" , "Claim (a person is guilty)" , "Declare or accuse without proof" .)