The Crossword Centre Clue-Writing Competition

CCCWC February competition voters’ comments
 
Clue no. 30: Meteorological phenomenon is mostly Brownian motion

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A clue to RAINBOW.
1 comment refers to this clue (from 1 competitor, 0 others)

Here is the text

Comments on the clue
1.Cryptically, though, it’s mostly Brownian in motion