Part of chicken new bishop mostly cooked? (8)
I believe the answer is:
wishbone
'part of chicken' is the definition.
(I've seen this before)
'new bishop mostly cooked?' is the wordplay.
'mostly' means to remove the last letter.
'cooked?' indicates anagramming the letters.
'new'+'bishop'='newbishop'
'newbishop' with its final letter removed is 'newbisho'.
'newbisho' is an anagram of 'WISHBONE'.
(Other definitions for wishbone that I've seen before include "Bird-part pulled by two people for luck" , "Ibsen who? (anag) - merrythought" , "Forked piece of a chicken" , "Supposedly lucky part of a fowl" , "Bit of the bird associated with luck" .)