Fungus — I'm lewd (anag) (6)

I believe the answer is:

mildew

(Other definitions for mildew that I've seen before include "Fungal plant disease" , "White powdery fungus" , "Fungus that produces mould on damp material" , "White coating on things exposed to damp" , "Fungal coating on plant" .)

I've seen this clue in The Guardian.

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