Rich site in field or a domain (8)
I believe the answer is:
eldorado
'rich site' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe there's a link between them I don't understand?
'in field or a domain' is the wordplay.
'in' says the answer is hidden in the clue.
'ELDORADO' can be found hidden inside 'field or a domain'.
Can you help me to learn more?
(Other definitions for eldorado that I've seen before include "rich land, so many thought" , "city of riches" , "wealthy location" , "source of wealth" , "a place of great wealth" .)