Left a stone erected topped with huge stone (8)
I believe the answer is:
megalith
'huge stone' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for megalith that I've seen before include "Huge ancient monument stone" , "Huge stone used in prehistoric monuments" , "Upright (prehistoric) stone" , "Large stone in a prehistoric monument" .)