Stranger to Scots nearly abandoned steam (6)

I believe the answer is:
uncool
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for uncool that I've seen before include "hot?" , "Not in fashion or with it" , "Old-fashioned" , "Not fashionable (colloq.)" , "Not with it (but warm?)" .)
