Famous performer’s backing singers (4)
I believe the answer is:
star
'famous performer's' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for star that I've seen before include "White blaze on a horse's forehead" , "Eg, Antares" , "Heavenly light" , "Actor in a principal role" , "Pointed shape" .)