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Sewage collector lost his head in Sophocles play (8)

Ross

I believe the answer is:

cesspool

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This clue might be a double definition.

'sewage collector' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'lost his head in sophocles play' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

Can you help me to learn more?

(Other definitions for cesspool that I've seen before include "Sump" , "Pit collecting filthy water" , "Covered pit where sewage is stored" , "Underground waste tank" , "Sink" .)

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