Comedians sent in at a singer's suggestion? (6)
I believe the answer is:
clowns
'comedians' is the definition.
(clown is a kind of comedian)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for clowns that I've seen before include "Circus comedians" , "Funny men in the circus" , "They amuse with ridiculous behaviour" , "Circus performers" , "Circus entertainers" .)