1) Ascertained 2) Cinched 3) Clinched 4) Double-checked 5) Got as a certainty 6) Guaranteed 7) Guarded 8) Iced 9) Left no doubt about 10) Made certain 11) Made safe 12) Put on ice 13) Safeguarded 14) Sealed Found on https://www.crosswordclues.com/clue/ensured
1) Ascertained 2) Cinched 3) Clinched 4) Double-checked 5) Got as a certainty 6) Guaranteed 7) Guarded 8) Iced 9) Left no doubt about 10) Made certain 11) Made safe 12) Put on ice 13) Safeguarded 14) Sealed