### Clue: Adhering to socialist principles following Tories' first victory in part of contest (4-4)
### Answer: LEFT WING 
 ### Explanation: Definition: Adhering to socialist principles
 [F(abbrev. for "following") + **1st letter of**(…' first) "Tories" + WIN(victory)] **contained in**(in) LEG(a part/a stage of a contest consisting of more than one encounter).