TV studio light (2,3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tv studio light</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>
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tv studio light</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for on air that I've seen before include "In the process of broadcasting - floating aloft?" , "Transmitting now!" , "Live broadcast" , "In the act of broadcasting" , "put out" .)