Place incredibly loaded with hidden gold (8)
I believe the answer is:
eldorado
'place' is the definition.
(mythical golden city)
'incredibly loaded with hidden gold' is the wordplay.
'incredibly' is an anagram indicator.
'with hidden' is an insertion indicator (inserted letters are hidden inside).
'gold' becomes 'or' ('or' is the heraldic name for gold).
'loaded' with letters rearranged gives 'eldado'.
'eldado' placed around 'or' is 'ELDORADO'.
(Other definitions for eldorado that I've seen before include "source of wealth" , "wealthy location" , "rich land, so many thought" , "a place of great wealth" , "city of riches" .)