Crossword Genius

Pig out, finding this food (7)

Ross

I believe the answer is:

truffle

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'food' is the definition.
(truffle is a kind of food)

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

Can you help me to learn more?

(Other definitions for truffle that I've seen before include "Rich food" , "Fretful for tasty underground fungus" , "2 (anag)" , "Fretful (anag)" , "Rich-flavoured fungus that grows undergrond" .)

I've seen this clue in The Telegraph.
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