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Relating countryside and fungal disease? (6)

Ross

I believe the answer is:

rustic

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'disease?' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

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

Can you help me to learn more?

(Other definitions for rustic that I've seen before include "unrefined" , "Simple and unsophisticated as in the country" , "Hodge" , "Relating to the countryside" , "Rural, country" .)

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