Artist who’s backed 75 per cent of Eastern philosophical system (4)

I believe the answer is:

goya

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'artist' is the definition.
(Francisco Goya)

I can't explain the remainder of the clue.

(Other definitions for goya that I've seen before include "Ay, go to see great Spanish painter" , "Span. C18 court painter" , "Eighteenth and nineteenth century Spanish painter" , "Francesco de ---, Sp. court painter" , "his etchings?" .)

I've seen this clue in The Times.

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