### Clue: A pretty old invader, one of four in VW? (5,5)
### Answer: ACUTE ANGLE 
 ### Explanation: Definition: one of four in VW
A charade of 'a' plus CUTE ('pretty') plus ANGLE ('invader' of England, a member of a Germanic tribe in the post-Roman period). V has one angle, W the other three, two facing up, one down.