Clue: Bit of bread offered to newt, which Ken Livingstone liked (3,4)
Answer: FAR-LEFT
Explanation: Definition: which Ken Livingstone liked
A charade of FARL ('bit of bread': Chambers "a quarter of a round cake of flour or oatmeal") plus EFT ('newt'). Two less than common words in one clue. EFT is the same word as newt, with the n coming from an eft.