From American, 'Yonder gulch' (6)
I believe the answer is:
canyon
'gulch' is the definition.
(thesaurus)
'from american yonder' is the wordplay.
'from' indicates the answer is hidden within the clue.
'CANYON' is hidden within 'american yonder'.
(Other definitions for canyon that I've seen before include "Deep, steep-sided valley" , "Deep valley with steep, even Grand, slopes" , "rift created" , "(N. Am.) ravine" , "The Grand . . . . . . of Colorado is a natural phenomenon in USA" .)