Float on the breeze (4)
I believe the answer is:
'float on the breeze' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for waft that I've seen before include "Cause to float through the air" , "Drift (like a faint smell)" , "Be borne on breeze" , "Propel lightly" , "Float on breeze" .)