Man alone at the bottom in ravine (6)
I believe the answer is:
george
'man' is the definition.
'alone at the bottom in ravine' is the wordplay.
'at the bottom' indicates one should take the final letters.
'in' means one lot of letters goes inside another.
'ravine' becomes 'gorge' (gorge is a kind of ravine).
The final letter of 'alone' is 'e'.
'e' going inside 'gorge' is 'GEORGE'.
(Other definitions for george that I've seen before include "Flight controller" , "England's patron saint" , "Ira's composer brother" , "Best Actor Oscar winner 1970, for 'Patton'" , "Man rowing on holiday" .)