Of the Middle Ages (8)
I believe the answer is:
medieval
'of the middle ages' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for medieval that I've seen before include "Of an earlier period" , "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" .)