Unfortunate accident's ending with rising smoke (6)
I believe the answer is:
tragic
'unfortunate' is the definition.
(I've seen this before)
'accident's ending with rising smoke' is the wordplay.
'accident's ending' becomes 'tra' (I am not sure about this - if you are sure you should believe this answer much more).
'with' is a charade indicator (letters next to each other).
'rising' says the letters should be written in reverse (letters written upwards in a down clue).
'smoke' becomes 'cig' (cigarette).
'cig' written backwards gives 'gic'.
'tra'+'gic'='TRAGIC'
Can you help me to learn more?
(Other definitions for tragic that I've seen before include "Disastrous, desperately sad" , "heartbreaking" , "Extremely sad; Mahler's 6th nickname" , "Grievous" , "Unfortunate" .)