Of historical interest, looked as though it might topple over! (6)

I believe the answer is:

listed

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'over' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?

I don't understand the rest of the clue.

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(Other definitions for listed that I've seen before include "Of architectural interest" , "Went over to one side" , "(Of building) officially protected" , "(Of building) designated as of historic importance" , "In a catalogue" .)

I've seen this clue in the Evening Standard.

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