Spoil Zaire's alternative source of energy (5)

I believe the answer is:

solar

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'energy' is the definition.
(solar energy is a kind of energy)

I can't explain the remainder of the clue.

(Other definitions for solar that I've seen before include "Relating to our star" , "Of the sun, as ray or panel" , "type of radiation" , "room" , "Sun-powered" .)

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

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