Producer of inflation
I believe the answer is:
air
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">producer of inflation</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for air that I've seen before include "See 21" , "Tune (on the G string?)" , "Tune; mien" , "Atmosphere; appearance" , "Song; ventilate" .)