Crossword Genius

Model or green fur (5)

Ross

I believe the answer is:

mould

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'model' is the definition.
(synonyms)

I can't explain the remainder of the clue.

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(Other definitions for mould that I've seen before include "Guide or control the development of" , "Crumbly soil" , "jelly?" , "Influence" , "Mildew" .)

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