Shoot forth with deuterium contrivance (4)

I believe the answer is:

dart

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'shoot' is the definition.
(I know that shoot can be written as dart)

I don't understand the rest of the clue.

(Other definitions for dart that I've seen before include "Slender pointed missile" , "Small spiked missile thrown in sport" , "Shoot out" , "Arrow; dash" , "shift fast" .)

I've seen this clue in the Sydney Morning Herald.

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