Ace scheme involved eating extremely restorative, mild food (5,6)
I believe the answer is:
cream cheese
'mild food' is the definition.
'cream cheese' can be an answer for 'food' (cream cheese is a kind of food). I'm not sure about the 'mild' bit.
'ace scheme involved eating extremely restorative' is the wordplay.
'involved' is an anagram indicator (involved can mean confusing or complex).
'eating' is an insertion indicator.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'restorative' with its middle removed is 're'.
'ace'+'scheme'='acescheme'
'acescheme' anagrammed gives 'camcheese'.
'camcheese' enclosing 're' is 'CREAM-CHEESE'.
Can you help me to learn more?
(Other definitions for cream cheese that I've seen before include "Food" , "something for those crackers" , "Rich dairy product" , "Soft dairy product" , "White foodstuff" .)