Crossword Genius

Pile of rocks used as a marker (5)

Ross

I believe the answer is:

cairn

(Other definitions for cairn that I've seen before include "Stone-pile landmark" , "Heap of stones as a monument" , "Stones piled up as a marker" , "Agree" , "Piled-stone marker" .)

I've seen this clue in the Sydney Morning Herald.
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