Each dish fills one (6)
I believe the answer is:
apiece
'each' is the definition.
(synonyms)
'dish fills one' is the wordplay.
'dish' becomes 'pie' (I've seen this before).
'fills' means one lot of letters goes inside another.
'one' becomes 'ace' (ace has a value of one in some card games).
'pie' going within 'ace' is 'APIECE'.
(Other definitions for apiece that I've seen before include "Per person" , "For or by each one of group" , "for everyone" , "A head" .)