Without function (4)
I believe the answer is:
sine
I believe this clue is a double definition.
'without' is the first definition.
('without' in Latin)
'function' is the second definition.
(mathematical function)
(Other definitions for sine that I've seen before include "Indefinitely, with no appointed date - . . . . die" , "Trig function" , "Trigonometrical function" , "Latin tag for indefinitely - . . . . die" , "Opposite/hypoteneuse" .)