Female ruler (5)
'female ruler' is the definition.
(female version of emperor)
This is all the clue.
(Other definitions for empress that I've seen before include "She rules a vast realm" , "one married to ruler?" , "Victoria, the > female penguin?" , "Josephine, for instance" , "Queen Victoria was one" .)
'female ruler' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for queen that I've seen before include "Female cat" , "Rock group; royal personage" , "powerful man on board" , "She commands" , "Female monarch" .)