Tapering, four-sided monument (7)

I believe the answer is:

obelisk

(Other definitions for obelisk that I've seen before include "Tapering pillar erected as monument" , "Cleopatra's Needle, perhaps?" , "Cleopatra's Needle, for example" , "Cleopatra's Needle, for instance" , "Monument with tall pillar and tapering top" .)

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

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