Without question (4)
'without question' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sure that I've seen before include "Completely certain" , "Undoubtedly true" , "Certain, confident" , "See 12" , "Positive" .)
(Other definitions for absolutely that I've seen before include "Utterly" , "You bet!" , "Totally" , "Yes, indeed!" , "Dead" .)