Portion of pastry dish with starters of chicken and egg (5)
I believe the answer is:
piece
'portion' is the definition.
(piece is a kind of portion)
'pastry dish with starters of chicken and egg' is the wordplay.
'pastry dish' becomes 'pie' (I've seen this before).
'with' means one lot of letters go next to another.
'starters of' indicates taking the first letters.
'and' says to put letters next to each other.
'egg' becomes 'e' (I can't explain this - if you can you should believe this answer much more).
The first letter of 'chicken' is 'c'.
'pie'+'c'+'e'='PIECE'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for piece that I've seen before include "man on board" , "Portion, bit" , "Section; firearm" , "constituent" , "Unpleasant character" .)