Oven's content fed to bird who'd appreciate it? (10)
I believe the answer is:
starveling
'who'd appreciate it?' is the definition.
I can't tell whether this defines the answer.
'oven's content fed to bird' is the wordplay.
'oven's content' becomes 've' (I can't justify this - if you can you should believe this answer much more).
'fed to' means one lot of letters goes inside another.
'bird' becomes 'starling' (I've seen this before).
've' placed within 'starling' is 'STARVELING'.
(Other definitions for starveling that I've seen before include "Literary tailor" , "famished child" , "Shakespeare's tailor" , "Shakespearean tailor" , "Ill-fed man" .)