Be greedy in the ravine? (5)
I believe the answer is:
gorge
I believe this clue is a double definition.
'be greedy' is the first definition.
(I've seen this in another clue)
'the ravine?' is the second definition.
(gorge is a kind of ravine)
'in' acts as a link.
(Other definitions for gorge that I've seen before include "Steep narrow valley" , "Cheddar, say" , "not fast" , "Devour" , "oesophagus" .)