One who founded dynasty in America after gold rush (8)
I believe the answer is:
augustus
'one who founded dynasty' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'america after gold rush' is the wordplay.
'america' becomes 'US' (United States).
'after' is a charade indicator (letters next to each other).
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'rush' becomes 'gust' (I have seen 'Rush of wind ' mean 'gust' so perhaps 'rush' could also mean 'gust').
'au'+'gust'='august'
'us' put after 'august' is 'AUGUSTUS'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for augustus that I've seen before include "one whose name was John?" , "Roman emperor, of a summer month?" , "head for Rome" , "Fort --, Scottish town" , "old ruler" .)