Crossword Genius

Active chemical substance (7)

Ross

I believe the answer is:

reagent

'active chemical substance' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for reagent that I've seen before include "Chemical in reaction" , "Chemical substance used in tests" , "Substance with characteristic reactions, used as a chemical test" , "Chemically active substance" , "What causes change" .)

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