A town rebuilt by a god (5)
I believe the answer is:
wotan
'a god' is the definition.
(Wotan is an example)
'a town rebuilt' is the wordplay.
'rebuilt' is an anagram indicator.
'a'+'town'='atown'
'atown' with letters rearranged gives 'WOTAN'.
'by' is the link.
(Other definitions for wotan that I've seen before include "Germanic god" , "Supreme god" , "Teutonic god in the Ring Cycle" , "Wagnerian head god" , "Another name for Odin" .)