Describing the Jewish law that fits together into a pattern (6)

I believe the answer is:

mosaic

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'pattern' is the definition.
(I know that mosaic is a type of pattern)

I don't understand the remainder of the clue.

(Other definitions for mosaic that I've seen before include "Design of small pieces of colored stone or glass (6)." , "It is pieced together" , "Design made of small pieces of colored stone or glass" , "Picture made up of coloured fragments" , "expressed in stones" .)

I've seen this clue in The Irish Independent.

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