Food nothing at all? Not quite — this person tucked in (7)
I believe the answer is:
oatmeal
'food' is the definition.
(oatmeal is a kind of food)
'nothing at all? not quite this person tucked in' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'not quite' means to remove the last letter.
'this person' becomes 'me' (the person writing).
'tucked in' indicates putting letters inside.
'at'+'all'='atall'
'atall' with its last letter removed is 'atal'.
'atal' going around 'me' is 'atmeal'.
'o'+'atmeal'='OATMEAL'
(Other definitions for oatmeal that I've seen before include "Colour - to a male (anag)" , "Kind of porridge" , "Eat loam (anag)" , "Powdery substance eaten" , "Sort of beige" .)