Bird descended in America (4)
I believe the answer is:
dove
This clue is a double definition.
'bird' is the first definition.
(dove is a kind of bird)
'descended in america' is the second definition.
(past tense of 'dive' in American English)
(Other definitions for dove that I've seen before include "Bird[s]" , "Bird representing peace" , "plunged in the Grand Canyon" , "Bird in the pigeon family" , "Peacemaker" .)