Rugged, rocky (6)
I believe the answer is:
craggy
I believe this is a double definition.
'rugged' is the first definition.
(synonyms)
'rocky' is the second definition.
(I've seen this in another clue)
(Other definitions for craggy that I've seen before include "with rough faces" , "(Of rock) rough, uneven" , "Weather-beaten" , "Mountainous" , "Rocky and steep" .)