Criminal drooled about a fabulously rich city (8)
I believe the answer is:
eldorado
'fabulously rich city' is the definition.
'eldorado' can be an answer for 'city' (I have seen 'city of riches' mean 'eldorado' so perhaps 'city' could also mean 'eldorado'). I am not sure about the 'fabulously rich' bit.
'criminal drooled about a' is the wordplay.
'criminal' is an anagram indicator.
'about' is an insertion indicator.
'drooled' anagrammed gives 'eldordo'.
'eldordo' going around 'a' is 'ELDORADO'.
Can you help me to learn more?
(Other definitions for eldorado that I've seen before include "rich land, so many thought" , "The golden land?" , "wealthy location" , "city, apparently lost" , "city of riches" .)