Chef's instructions: pieces of endive and chicory ... filling ... ready to eat (6)
I believe the answer is:
recipe
'chef's instructions' is the definition.
(I've seen this before)
'pieces of endive and chicory filling ready to eat' is the wordplay.
'pieces of' says to take the initial letters.
'and' is a charade indicator (letters next to each other).
'filling' indicates the central letters (the letters which fill the word).
'ready' becomes 'ripe' (similar in meaning).
'to eat' means one lot of letters goes inside another.
The middle of 'chicory' is 'c'.
The initial letter of 'endive' is 'e'.
'e'+'c'='ec'
'ec' going inside 'ripe' is 'RECIPE'.
(Other definitions for recipe that I've seen before include "Chef's instructions" , "Directions for cooking the turkey e.g." , "Cook's instructions" , "Cooking instructions" , "Directions for preparing food, etc" .)