Ancient medal I’ve restored (8)
I believe the answer is:
medieval
'ancient' is the definition.
'medal i've restored' is the wordplay.
'restored' is an anagram indicator.
'medal'+'ive'='medalive'
'medalive' anagrammed gives 'MEDIEVAL'.
(Other definitions for medieval that I've seen before include "Relating to the Middle Ages" , "Am veiled in style of the middle ages" , "Of the middle ages, or really old-fashioned" , "Belonging to the Middle Ages" , "Of an earlier period" .)