Administrative triumvirate in Russian vehicle (6)
I believe the answer is:
troika
This clue might be a double definition.
'administrative triumvirate' is the first definition.
'troika' can be an answer for 'triumvirate' (troika is a kind of triumvirate). I am not certain of the 'administrative' bit.
'russian vehicle' is the second definition.
(I've seen this in another clue)
'in' acts as a link.
Can you help me to learn more?
(Other definitions for troika that I've seen before include "Russian horse-drawn vehicle" , "Threesome" , "cart" , "Three-horse Russian vehicle" , "Russian carriage pulled by three horses abreast" .)