Bare rock touching hold almost caused ruin (5)
I believe the answer is:
havoc
'ruin' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for havoc that I've seen before include "Total destruction" , "Disaster" , "Chaos and destruction" , "desolation" , "Widepsread destruction" .)