Finally deliver cooked pie -- it's ready to be eaten (4)
I believe the answer is:
ripe
'ready to be eaten' is the definition.
(I've seen this before)
'finally deliver cooked pie' is the wordplay.
'finally' suggests the final letters.
'cooked' indicates an anagram.
The last letter of 'deliver' is 'r'.
'pie' with letters rearranged gives 'ipe'.
'r'+'ipe'='RIPE'
'it's' acts as a link.
(Other definitions for ripe that I've seen before include "Mature, ready for eating" , "daring" , "Ready for harvesting, in its prime" , "Mature, fully grown" , "Opportune" .)