Fungus in ground you reported (6)

I believe the answer is:

mildew

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'fungus' is the definition.
(mildew is a kind of fungus)

I can't explain the rest of the clue.

(Other definitions for mildew that I've seen before include "White powdery fungus" , "Fungal plant disease" , "Fungal coating on plant" , "Fungal disease in plants" , "White coating caused by damp" .)

I've seen this clue in The Times.

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