A royal primarily in woven satin, Russian empress (7)
I believe the answer is:
tsarina
'russian empress' is the definition.
(I've seen this before)
'a royal primarily in woven satin' is the wordplay.
'primarily' suggests taking the first letters.
'in' indicates putting letters inside.
'woven' is an anagram indicator.
The initial letter of 'royal' is 'r'.
'a'+'r'='ar'
'satin' with letters rearranged gives 'tsina'.
'ar' placed within 'tsina' is 'TSARINA'.
(Other definitions for tsarina that I've seen before include "Consort" , "titled lady" , "Wife of royal Russian" , "Catherine, say" , "queen" .)