City where opal reset with a sou? (3,5)
I believe the answer is:
sao paulo
'city' is the definition.
(Sao Paulo is an example)
'opal reset with a sou?' is the wordplay.
'reset with' is an anagram indicator.
'a'+'sou'='asou'
'opal' with its letters mixed up with 'asou' gives 'SAO PAULO'.
'where' is the link.
(Other definitions for sao paulo that I've seen before include "City in southern Brazil" , "Large city of Brazil" , "Brazilian city" , "Latin city" .)