Crossword Genius

Fretful (anag) (7)

Ross

I believe the answer is:

truffle

(Other definitions for truffle that I've seen before include "Underground delicacy" , "Fretful for tasty underground fungus" , "2 (anag)" , "Chocolaty sweet" , "Edible subterranean fungus" .)

I've seen this clue in The Guardian.
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