### Clue: British libertines put on record they will slow things down (4,6)
### Answer: DISC BRAKES 
 ### Explanation: Definition: they will slow things down
 B(abbrev. for "British") + RAKES(libertines/roues) **placed below**(… put on, in a down clue) DISC(a record/a recording in the form of a, well, disc).