Recurring theme or idea (5)
I believe the answer is:
motif
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">recurring theme</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">idea</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(motif is a kind of idea)</span><br/ ><br/ ></span>
(Other definitions for motif that I've seen before include "sign" , "Characteristic theme" , "Logo -- pattern" , "Main theme in music" , "Theme or recurring feature in music or writing" .)