See smoke rolling back — here's reason (5)
I believe the answer is:
logic
'back here's reason' is the definition.
'logic' can be an answer for 'reason' (logic is using reason). I am not certain of the 'back here's' bit.
'see smoke rolling' is the wordplay.
'see' becomes 'lo' (archaic exclamation meaning 'look!').
'smoke' becomes 'cig' (cigarette).
'rolling' says the letters should be written in reverse.
'cig' backwards is 'gic'.
'lo'+'gic'='LOGIC'
Can you help me to learn more?
(Other definitions for logic that I've seen before include "The science of reasoning from cause to effect" , "using premises" , "Sound reasoning" , "Sound sense" , "method of reasoning" .)