Russia’s ruling family until 1917 (7)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
romanov
(Other definitions for romanov that I've seen before include "Name of dynasty that ruled Russia from 1613-1917" , "Russian house" , "The last dynasty to rule Russia" , "Russian imperial line that ruled from 1613 to 1917" , "Russian dynasty before the Bolshevik Revolution" .)