Livingstone always turned up in an African country (5)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

A charade of KEN and AY reversed (‘turned up’ works because it’s a down clue). More politicians, but from a different era: Ken Livingstone was MP for Brent and also Mayor of London in the noughties. Dr Livingstone (I presume) was the African explorer.