Hormone not entirely causing offence, containing no tritium (7)

I believe the answer is:

insulin

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'hormone' is the definition.
(I know that insulin is a type of hormone)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for insulin that I've seen before include "hormone treatment?" , "Hormone controlling sugar supply" , "Protein hormone in the pancreas" , "Sugar-controlling hormone" , "Hormone - nil in us (anag)" .)

I've seen this clue in The Independent.

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