Crossword Genius

Origin of smelly green secretion (5)

Ross

I believe the answer is:

slime

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'secretion' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'origin of smelly green' is the wordplay.
'origin of' indicates taking the first letters.
'green' becomes 'lime' (lime is a shade of green).
The first letter of 'smelly' is 's'.
's'+'lime'='SLIME'

Can you help me to learn more?

(Other definitions for slime that I've seen before include "Goo" , "Sludge, gloop" , "Gunge" , "Gooey seeping stuff" , "Moist slippery stuff" .)

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