### Clue: Cable serving under Tory and finally brought round (9)
### Answer: CONVINCED 
 ### Explanation: Definition: brought round
 { VINCE(surname Cable, currently UK Secretary of State for Business, Innovation and Skills) **placed below**(serving under, in a down clue) CON(abbrev. for a Tory;a Conservative) } + **the last letter of**(finally) "and". And, though a Lib Dem, one could say he is serving under a Tory, which the PM is.