"Friday" singer Black (7)
I believe the answer is:
rebecca
'friday singer black' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rebecca that I've seen before include "Du Maurier heroine at Manderley" , "riotous girl" , "Literary heroine" , "Daphne du Maurier novel; girl's name" , "One of the four matriarchs of the Jewish people (anglicised)" .)