Cooler not following escarpment (5)
I believe the answer is:
'escarpment' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ridge that I've seen before include "Line of raised ground" , "Line where two upward sloping surfaces meet" , "Crest - spine" , "Long narrow crest" , "Long, narrow hilltop" .)