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' says the answer is hidden in the clue.
'CANYON' is hidden within '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" .)