Mushroom bake's filling consumed by Muslim (8)
I believe the answer is:
shiitake
'mushroom' is the definition.
(I know that Shiitake is a type of mushroom)
'bake's filling consumed by muslim' is the wordplay.
'filling' says to take the centre (the letters which fill the word).
'consumed by' means one lot of letters goes inside another (inserted letters get consumed).
'muslim' becomes 'shiite' (Shiite is an example).
The central letters of 'bake' are 'ak'.
'ak' placed into 'shiite' is 'SHIITAKE'.
(Another definition for shiitake that I've seen is " Type of mushroom".)