White Russian dresses in clothing from Tashkent (7)
I believe the answer is:
tsarist
'white russian' is the definition.
(white Russians supported Tsar Nicholas II)
'dresses in clothing from tashkent' is the wordplay.
'dresses' becomes 'saris' (sari is a kind of dress).
'in' indicates putting letters inside.
'clothing from' means to remove the middle letters (only the letters which 'clothe' the word).
'tashkent' with its middle removed is 'tt'.
'saris' going within 'tt' is 'TSARIST'.
(Other definitions for tsarist that I've seen before include "Supporter of the Russian Empire" , "Russian monarchist" , "Bolshevik opponent" , "Of emperors of old Russia" , "Artists (anag.); supporter of Russian emperor" .)