Musical pattern (6)
I believe the answer is:
rhythm
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">musical pattern</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 rhythm that I've seen before include "Sense of a steady beat" , "Stress pattern (mus., poet,)" , "Cycle -- cadence" , "Musical tempo or beat" , "Regular succession of sounds" .)