Radio interference (6)
I believe the answer is:
static
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">radio interference</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for static that I've seen before include "Changeless" , "Unmoving like kind of electricity" , "Inert or passive, like some electricity" , "Atmospheric disturbance" , "Crackling or hissing noise caused by electrical interference" .)