Bangkok Road sporadically removed old market (5)

I believe the answer is:

agora

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'old market' is the definition.
(agoras were market spaces in ancient Greece)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for agora that I've seen before include "Place for meetings" , "11 [LOLLY] to Ben-Gurion" , "One hundredth of a shekel" , "Assembly or market place in ancient Greece" , "Marketplace in Athens" .)

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

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