Wales site rebuilt anyway (9)
I believe the answer is:
leastwise
'anyway' is the definition.
(synonyms)
'wales site rebuilt' is the wordplay.
'rebuilt' indicates anagramming the letters.
'wales'+'site'='walessite'
'walessite' is an anagram of 'LEASTWISE'.
(Other definitions for leastwise that I've seen before include "anyway" , "If nothing else" , "in Hollywood at any rate" , "However (US)" , "in any case" .)