All the people cook dory by Eve (9)
I believe the answer is:
everybody
'all the people' is the definition.
(I've seen this before)
'cook dory by eve' is the wordplay.
'cook' indicates an anagram.
'dory'+'by'+'eve'='dorybyeve'
'dorybyeve' with letters rearranged gives 'EVERYBODY'.
(Other definitions for everybody that I've seen before include "All persons" , "people generally?" , "One and all" , "All and sundry" .)