Internal organs of ten different birds (8)
I believe the answer is:
entrails
'internal organs' is the definition.
(I've seen this before)
'ten different birds' is the wordplay.
'different' indicates an anagram.
'birds' becomes 'rails' (rail is a kind of bird**).
'ten' anagrammed gives 'ent'.
'ent'+'rails'='ENTRAILS'
'of' acts as a link.
(Other definitions for entrails that I've seen before include "Intestines of animals" , "Bowels or intestines" , "Internal organs of animals" , "Intestines, guts" , "Internal parts of animals" .)