I have changed, taking the award all round — it is antique (8)
I believe the answer is:
medieval
'is antique' is the definition.
(thesaurus)
'i have changed taking the award all round it' is the wordplay.
I cannot really see how this works, but
'i' could be 'me' and 'me' is located in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for medieval that I've seen before include "Relating to the Middle Ages" , "Of the middle ages, or really old-fashioned" , "Am veiled in style of the middle ages" , "Belonging to the Middle Ages" , "Of an earlier period" .)