### Clue: His mum's Conservative leader embracing Republican (4)
### Answer: MARY 
 ### Explanation: His mum's Conservative leader embracing Republican (4)
**MAY **("Conservative leader") "embracing" **R**(epublican) 
I assume that the **HIS MUM** in the clue refers to Mary, Mother of God, but as an atheist, I can't be sure.