Crossword Genius

Start to discharge organic substance (6)

Ross

I believe the answer is:

tissue

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

'substance' is the definition.
(I know that tissue is a substance)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tissue that I've seen before include "See 11" , "'Soft, thin paper (6)'" , "Disposable piece of absorbent paper" , "cell block?" , "Paper hankie" .)

I've seen this clue in the Sydney Morning Herald.
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