Crossword Genius

Rich food source of tummy upset (7)

Ross

I believe the answer is:

truffle

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'rich food' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for truffle that I've seen before include "Rich food" , "Sweet - edible fungus growing underground" , "Valued culinary fungus" , "Witty remark" , "Underground delicacy" .)

I've seen this clue in The Sun.
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