Crossword Genius

Cooler not following escarpment (5)

Ross

I believe the answer is:

ridge

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'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" .)

I've seen this clue in The Sun.
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