Spanish "a” (3)
I believe the answer is:
una
'spanish a' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for una that I've seen before include "Girl's name; indefinite article (f. Italian)" , "- - Stubbs, comedy actress" , "of satellite with no sides" , "Girl" , "She's one in Italy." .)