Tall tapering pyramid (7)

I believe the answer is:

obelisk

(Other definitions for obelisk that I've seen before include "Cleopatra's Needle, for instance" , "Stone "needle"" , "Needle-like column" , "Tapering square stone monument" , "Cleopatra's Needle, for example" .)

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

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