Steep or rugged rock face (4)
I believe the answer is:
crag
This clue is a double definition.
'steep' is the first definition.
(thesaurus)
'rugged rock face' is the second definition.
(I've seen this in another clue)
(Other definitions for crag that I've seen before include "Steep rocky cliff" , "Steep, overhanging rock" , "Rugged rock face" , "Steep rock, peak" , "Rocky hilltop" .)