Expensive Fungus, Rooted Out by Pigs
Puzzle 9 of Under the Ground Easy Pack
Question is: Expensive Fungus, Rooted Out by Pigs
and the answer is: TRUFFLE
Word Meaning:
TRUFFLE — Any of various edible fungi, of the genus Tuber, that grow in the soil in southern Europe; the earthnut.
Definitions from Wiktionary.