### Clue: Transfix my French setter with an increase in sound (9)
### Answer: MESMERIZE 
 ### Explanation: Definition: Transfix
 MES(French for "my" as in "mes amis et moi") + ME(self-referential pronoun for the setter of this puzzle) **plus**(with) **homophone of**(… in sound) "rise"(an increase, in quantity, say).
The clue also works with the non-American spelling of the solution and without the homophone.