Crossword Genius

One cinder in treatment of a gland (9)

Ross

I believe the answer is:

endocrine

I'm a little stuck... Click here to teach me more about this clue!

'gland' is the definition.
(I know that endocrine is a type of gland)

'one cinder in treatment of a' is the wordplay.
'one cinder' can be anagrammed to 'ENDOCRINE'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Another definition for endocrine that I've seen is " Of gland, secreting straight into blood and not through duct".)

I've seen this clue in The Daily Express.
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