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2d. Rival drops slow Aussie (3) E?U. Emu? But why?
17a. Original uses of DNA might make this secure. (4,3,5) S?FE A?D ?O?N? Safe and sound is an anagram of USES OF DNA DNA but where is the instruction to use DNA twice or DNA and AND?

2d. Emulate = rival. Take off the late/'slow' and you get Emu, Aussie

2d emuLATE
17a anagram of usesofdnsa make "safe" and "sound"

Thank you, kirby and malone. Had a look on the Times forum and 3D showing as problem there so I don't feel so bad about not getting it!