Fire-breather to keep smoking? (6)
I believe the answer is:
dragon
'fire-breather' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
(Other definitions for dragon that I've seen before include "Fire-breathing beast" , "Fiery monster" , "Fire-breathing creature slain by St George" , "St George is said to have killed one" , "particularly intimidating woman" .)