Pass tin over there (6)
I believe the answer is:
canyon
'pass' is the definition.
(thesaurus)
'tin over there' is the wordplay.
'tin' becomes 'can' (synonyms).
'over there' becomes 'yon' (archaic word meaning 'over there').
'can'+'yon'='CANYON'
(Other definitions for canyon that I've seen before include "grand spectacle in Arizona" , "'Deep ravine, gorge (6)'" , "Defile" , "Deep fissure" , "Big rift" .)