Instructions for dish — ready to eat with even bits of peach in (6)
I believe the answer is:
recipe
'instructions for dish' is the definition.
(I've seen this before)
'ready to eat with even bits of peach in' is the wordplay.
'ready to eat' becomes 'ripe' (I've seen this before).
'with' means one lot of letters goes inside another.
'bits of' says to take the initial letters (I've seen 'bit of' mean this).
'peach in' becomes 'c' (I can't justify this - if you can you should give a lot more credence to this answer).
The first letter of 'even' is 'e'.
'e'+'c'='ec'
'ripe' placed around 'ec' is 'RECIPE'.
(Other definitions for recipe that I've seen before include "Instructions on how to cook" , "Directions for preparing food, etc" , "Cooking prescription" , "Kitchen directions" , "Formula for food dish" .)