Estrogen or testosterone (7)

I believe the answer is:

hormone

(Other definitions for hormone that I've seen before include "Growth secretion" , "Substance like insulin" , "Secretion transported in the blood" , "Internal secretion - moorhen (anag)" , "Glandular secretion with stimulating properties" .)

I've seen this clue in the King Feature Syndicate and the New York Times.

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