Crossword Genius

Square old man caged up zebras out east (5)

Ross

I believe the answer is:

plaza

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'square' is the definition.
(synonyms)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for plaza that I've seen before include "Public square, as in Spanish town" , "Public square - shopping centre" , "Hotel" , "Open urban square or public area" , "Public square or market" .)

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