Is she unique? (3)
I believe the answer is:
una
'is she' is the definition.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for una that I've seen before include "- Stubbs, Eng. actress" , "A single Spanish" , "Diego's one" , "She's one in Italy." , "of satellite with no sides" .)