Even a dory somehow can be prepared for roasting (4-5)
I believe the answer is:
oven-ready
'be prepared for roasting' is the definition.
'even a dory somehow' is the wordplay.
'somehow' indicates an anagram.
'even'+'a'+'dory'='evenadory'
'evenadory' is an anagram of 'OVEN-READY'.
'can' is the link.
(Other definitions for oven-ready that I've seen before include "Pre-cooked" , "Already prepared for cooking (of chickens)" .)