Gentle movement of air (4)
I believe the answer is:
waft
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gentle movement of air</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for waft that I've seen before include "Sail" , "Be borne on breeze" , "Drift (like a faint smell)" , "Propel lightly" , "Float on breeze" .)