### Clue: When mixing ripple puff, it's appropriate to show self-restraint (5,5,3)
### Answer: STIFF UPPER LIP 
 ### Explanation: Definition: self-restraint
 **Anagram of**(mixing) RIPPLE PUFF, IT'S.
Answer: Self-restraint in expression of emotion in the face of adversity, reputedly a characteristic of the British.