Partially scan yonder gorge (6)
I believe the answer is:
canyon
'gorge' is the definition.
(I've seen this before)
'partially scan yonder' is the wordplay.
'partially' indicates a hidden word.
'CANYON' is hidden in the letters of 'scan yonder'.
(Other definitions for canyon that I've seen before include "geographical feature" , "Deep fissure" , "(N. Am.) ravine" , "Ravine formed by a river" , "gully" .)