The most common and most likely answer to this crossword clue is the 8 letter word PLUTONIC
I've seen this crossword clue in The Guardian
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More clues leading to the result PLUTONIC
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The cryptic/wordplay part
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What does PLUTONIC mean?
PLUTONIC adjective- Of or relating to Pluto, the Greek and Roman god of the underworld; demonic, infernal.
- (by extension) Of, relating to, or having characteristics associated with the underworld; dark, gloomy; mournful.
- Pertaining to the astrological influence of Pluto, formerly regarded as a planet.
- Of or relating to the dwarf planet Pluto.
- (by extension) Of or pertaining to rocks formed deep in the Earth's crust, rather than by volcanoes at the surface of the Earth.
- (by extension) Of, pertaining to, or supporting plutonism.
- Containing plutonium in a higher oxidation state.
- Containing plutonium in a higher oxidation state.