Old-fashioned but alive, and made changes (9)
I believe the answer is:
mediaeval
'old-fashioned' is the definition.
(I've seen this before)
'alive and made changes' is the wordplay.
'and' says to put letters next to each other.
'changes' indicates anagramming the letters.
'alive'+'made'='alivemade'
'alivemade' with letters rearranged gives 'MEDIAEVAL'.
'but' acts as a link.
(Other definitions for mediaeval that I've seen before include "out of the Dark Ages" , "Old-fashioned" .)