Charitable gift is all about mining industry leaders gaining supremacy (10)

I believe the answer is:

domination

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'supremacy' is the definition.
(I know that supremacy can be written as domination)

I cannot understand how the rest of the clue works.

(Other definitions for domination that I've seen before include "Absolute authority" , "rule" , "Command, power" , "Controlling influence" .)

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

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