### Clue: You, having changed just one letter, should get a medal! (6)
### Answer: SILVER 
 ### Explanation: Definition: a medal
 "solver"(one trying this puzzle, refered to by the setter by "you";the  second person pronoun) ***with** *"o" ***replaced by** *"i"(having changed just one letter).
Defn: … for second position in a competition.