Some vestige of sanctity? (5)
I believe the answer is:
relic
'some vestige' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for relic that I've seen before include "Old memento" , "Object surviving from earlier times" , "Memorial object" , "Surviving ancient custom" , "Venerated memento" .)