Tune; broadcast (3)
I believe the answer is:
air
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">tune</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(air can mean a piece of music)</span><br/ ><br/ >'<span class="explanation-format__original">broadcast</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for air that I've seen before include "Atmosphere surrounding us" , "- brick; - bed; - brush" , "Broadcast; express" , "Bearing, manner" , "Cause of inflation" .)