For each person, a filled dish came unfilled (6)
I believe the answer is:
apiece
'for each person' is the definition.
(I've seen this before)
'a filled dish came unfilled' is the wordplay.
'filled dish' becomes 'pie' (dish with a filling).
'unfilled' says to hollow out the word (remove centre letters).
'came' with its centre taken out is 'ce'.
'a'+'pie'+'ce'='APIECE'
(Other definitions for apiece that I've seen before include "for everyone" , "Per person" , "A head" , "For or by each one of group" .)