Procure license to conceal artifact (5)
I believe the answer is:
relic
'artifact' is the definition.
(a relic is an artifact associated with a saint)
'procure license to conceal' is the wordplay.
'to conceal' says the answer is hidden in the clue.
'RELIC' is hidden in the letters of 'procure license'.
(Other definitions for relic that I've seen before include "precious object" , "Part of a holy person's body or possession" , "Trace" , "Fossil" , "One interestingly old" .)