Crossword Genius

Active chemical substance (7)

Ross

I believe the answer is:

reagent

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">active chemical substance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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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