Washington Monument, e.g. (7)

I believe the answer is:

obelisk

(Other definitions for obelisk that I've seen before include "Cleopatra's Needle, for instance" , "Stone "needle"" , "Tall tapering pillar as monument or landmark" , "Tapering, rectangular stone column" , "Square stone column that tapers" .)

I've seen this clue in The Star Tribune.

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