Inhale from a smoking thing (6)
I believe the answer is:
dragon
'a smoking thing' is the definition.
(a dragon breathes fire)
'inhale from' is the wordplay.
'inhale' becomes 'drag' (dragging is a kind of inhaling).
'from' becomes 'on' (I can't explain this - if you can you should give a lot more credence to this answer).
'drag'+'on'='DRAGON'
(Other definitions for dragon that I've seen before include "Formidable woman" , "kite" , "St George killed this flying monster" , "Mythical flying creature killed by St George" , "Legendary fire-breather" .)