Cliff Richard initially invested in Manx getaway, intended to spend advance (10)
I believe the answer is:
escarpment
'cliff' is the definition.
(type of steep slope)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for escarpment that I've seen before include "Face" , "Bluff" , "cliff" , "Long edge of plateau" , "Precipitous side of hill" .)