Singer Coolidge (4)
I believe the answer is:
rita
'singer coolidge' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rita that I've seen before include "Educating - - , film" , "...Hayworth, ...Coolidge, ... ''Educating ...''" , "The Beatles' lovely girl" , "subject of education" , "-- Hayworth, US film actress" .)