Actress Merkel (3)
I believe the answer is:
una
'actress merkel' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for una that I've seen before include "A single Spanish" , "of satellite with no sides" , "Girl's name; indefinite article (f. Italian)" , "woman" , "- - Stubbs, comedy actress" .)