Joni Mitchell's second album, released in 1969 (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
clouds
(Other definitions for clouds that I've seen before include "Cumulus and stratus, say" , "''I've looked at .... that way'' (Joni Mitchell)" , "becomes opaque" , "They float in the atmosphere" , "Swarms" .)