Gnu edible when minced in boiled stew (10)
I believe the answer is:
wildebeest
'gnu' is the definition.
(synonyms)
'edible when minced in boiled stew' is the wordplay.
'when minced' indicates anagramming the letters (letters minced or ground up into a new form).
'in' indicates putting letters inside.
'boiled' is an anagram indicator.
'edible' with letters rearranged gives 'ildebe'.
'stew' with letters rearranged gives 'west'.
'ildebe' placed within 'west' is 'WILDEBEEST'.
(Other definitions for wildebeest that I've seen before include "antelope" , "large animal" , "game in Africa" , "beast" , "Gnu" .)