Crossword Genius

Descriptive of stones or tablets? (6)

Ross

I believe the answer is:

mosaic

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'descriptive' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

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(Other definitions for mosaic that I've seen before include "Design of many small pieces" , "Design made of small pieces of coloured stone or glass" , "Decorative work of small hard pieces" , "Small square in pattern" , "from one of the prophets" .)

I've seen this clue in The Times.
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