An ox, a fragrance or a tech entrepreneur? (4)

I believe the answer is:

musk

(Other definitions for musk that I've seen before include "Perfume substance" , "that smells strongly" , "Strong-smelling substance used in 9" , "Strong-smelling glandular secretion" , "16 21 [INDIAN IMPORT]" .)

I've seen this clue in The Guardian.

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