Sphygmus; rhythm (5)
I believe the answer is:
pulse
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">sphygmus</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">rhythm</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I have seen 'Regular rhythm ' mean 'pulse' so perhaps 'rhythm' could also mean 'pulse')</span><br/ ><br/ ></span>
(Other definitions for pulse that I've seen before include "Bean - throb" , "When you're gone, you haven't one" , "Vitality" , "enjoyed by vegans?" , "Heart rhythm" .)