清 puts 氵 water with 青 qīng, which supplies the sound. Water gives the first sense, clear water. From there it grew to 'clear', 'clear out', 'clean', and 'pure'.
Drawn as: water
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Example Sentences
天空很清，能看到很多星星。
tiānkōnghěnqīng ， néngkàndàohěnduōxīngxīng 。
The sky is very clear, and many stars can be seen.