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Shiny granite close-up is regularly — this? (7)

Ross

I believe the answer is:

igneous

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'shiny' is the definition.
Although both the answer and definition are adjectives, I cannot see how they can define each other.

I don't understand how the remainder of the clue works.

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(Other definitions for igneous that I've seen before include "Formed of solidified magma" , "(Rock) set from lava" , "Produced by the action of intense heat" , "Of fire, like rocks formed from molten material" , "Type of rock with molten origin" .)

I've seen this clue in The Times.
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