Crossword Genius

Patchy picture pertaining to a law-giver (6)

Ross

I believe the answer is:

mosaic

I'm a little stuck... Click here to teach me more about this clue!

'patchy picture' is the definition.
'mosaic' can be an answer for 'picture' (mosaic is a kind of picture). I'm not sure about the 'patchy' bit.

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

Can you help me to learn more?

(Other definitions for mosaic that I've seen before include "Decorative work of small hard pieces" , "Design made of small pieces of colored stone or glass" , "Artistic design of glass or stones" , "Picture/pattern in small coloured pieces" , "Design of small pieces of colored stone or glass (6)." .)

I've seen this clue in The Irish Independent.
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