Precipices (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
cliffs
'precipices' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for cliffs that I've seen before include "High, steep rockfaces" , "Sheer rock faces overlooking sea" , "Dover has white ones" , "Precipices" , "High steep rocks" .)