Deep narrow valley (5)
(Other definitions for gorge that I've seen before include "Steep raving (Cheddar)" , "Make this rise to sicken or disgust" , "Wolf" , "Deep valley" , "Cheddar, say" .)
(Other definitions for ravine that I've seen before include "Type of gorge" , "'Deep, steep valley (6)'" , "Deep narrow gorge between mountains" , "Vainer in narrow gorge" , "Canyon" .)