Regular beat (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">regular beat</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 "Musical pulse" , "Musical tempo or beat" , "Sense of a steady beat" , "Regular beat in music" , "Measured beat" .)
(Other definitions for pulse that I've seen before include "Green" , "flageolet?" , "Heart rhythm" , "Rhythmical throb of arteries" , "Rhythmic throbbing" .)