Crossword Genius

Optical toy that produces constantly changing patterns (12)

Ross

I believe the answer is:

kaleidoscope

(Other definitions for kaleidoscope that I've seen before include "Optical pattern-making toy" , "Constantly changing pattern" , "Toy making coloured patterns" , "poodle is plastered with cake" , "A changing pattern of colours, shapes" .)

I've seen this clue in the Sydney Morning Herald.
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