Clue: Put Up, Up and Away under film, raising tempo initially, and cause a violent reaction (4,3,3)
Answer: PUSH TOO FAR
Explanation: Definition: cause a violent reaction
 **Reversal of**(Put Up, in a down clue) UP **plus**(and) [ FAR(away/separated by distance) **placed below**(under, in a down clue) SHOOT(to film/record with a camera) **with ****1st letter of**(… initially) "tempo" **moved up**(raising …, in a down clue) ].