Hormone secreted by the islets of Langerhans (7)

I believe the answer is:

insulin

(Other definitions for insulin that I've seen before include "Treatment for diabetes" , "Hormone that controls the body's sugar absorption" , "Hormone or medication controlling body's sugar level" , "Hormone: deficiency results in diabetes" , "Hormone that regulates glucose levels" .)

I've seen this clue in The Times.

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