This is the 9692nd most frequent Russian word.
чистый
"Чистый" means "clean" or "pure."
Here, 'чистый' is used to mean 'pure' or 'complete', describing the concept of order.
В комнате был чистый порядок.
There was pure order in the room.
In this context, 'чистый' is describing a physical state of cleanliness, meaning 'clean'.
После завтрака я надела чистую рубашку.
After breakfast, I put on a clean shirt.
The word 'чистый' here is metaphorical, signifying 'pure' in moral or emotional terms.