Blow smoke (4)
I believe the answer is:
puff
I believe this is a double definition.
'blow' is the first definition.
(I know that blow can be written as puff)
'smoke' is the second definition.
(I know that puff is a more specific form of the action smoke)
(Other definitions for puff that I've seen before include "plug" , "Light pastry; some wind" , "Light pastry; advert" , "type of pastry" , "Short blow (of smoke)" .)