Sign of saintliness (4)
I believe the answer is:
halo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sign of saintliness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for halo that I've seen before include "Saint's circle of light" , "Circle over saint's head in painting" , "Aureole" , "Glittering aura" , "Nimbus" .)