Opus from South Pole produced between a slave and a citizen? (5)

I believe the answer is:

helot

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'between a slave and a citizen?' is the definition.
I can't judge whether this defines the answer.

'opus from south pole produced' is the wordplay.
'from' suggests deleting specific letters.
'produced' is an anagram indicator.
'south'+'pole'='southpole'
'southpole' with 'opus' taken out is 'thole'.
'thole' anagrammed gives 'HELOT'.

Can you help me to learn more?

(Other definitions for helot that I've seen before include "Greek serf" , "One made to work" , "He's bound to land" , "Serf of ancient Sparta" , "Spartan serf" .)

I've seen this clue in The Irish Times.

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