Without, prep. + abl., eg tu ____ pennis vola, Plaut. As. 93 (4)

I believe the answer is:

sine

(Other definitions for sine that I've seen before include "Indispensable condition" , "Indefinitely, with no appointed date - . . . . die" , "Opposite/hypoteneuse" , "Without; maths function" , "Latin tag for indefinitely - . . . . die" .)

I've seen this clue in The Times.

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