Flatulent ileitis is partly produced by this vegan food (6)
I believe the answer is:
lentil
'this vegan food' is the definition.
'lentil' can be an answer for 'food' (lentil is a kind of food). I'm not certain of the 'this vegan' bit.
'flatulent ileitis is partly' is the wordplay.
'is partly' indicates a hidden word (part of the clue is used).
'LENTIL' can be found hidden inside 'flatulent ileitis'.
'produced by' acts as a link.
Can you help me to learn more?
(Other definitions for lentil that I've seen before include "Leguminous vegetable" , "Edible dried pulse" , "Plant - pulse" , "Edible leguminous plant seed" , "Pulse used in cooking" .)