Petrified relic (6)
I believe the answer is:
fossil
'petrified relic' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for fossil that I've seen before include "Animal remnant preserved in rock" , "Lasting impression" , "Prehistoric remnant" , "This fuel is natural, extracted from the ground" , "The remains of a plant or animal that existed in a past geological age" .)