Crossword Genius

Rich site in field or a domain (8)

Ross

I believe the answer is:

eldorado

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Sun.
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