### Clue: One favouring what's new, first seen by river in Minnesota (9)
### Answer: MODERNIST 
 ### Explanation: Definition: One favouring what's new
 IST(letters that look like 1st;first) **placed after**(seen by, in an across clue) [ODER(the river in central Europe) **contained in**(in) MN(abbrev. for the US state of Minnesota, used with zip codes).
Defn:  Especially in art and literature.