Buffoon, one of several appearing together on short London street (9)
I believe the answer is:
harlequin
'buffoon' is the definition.
(I know that harlequin is a type of buffoon)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for harlequin that I've seen before include "Entertainer in diamond-patterned clothing" , "Traditional pantomime character" , "London rugby player" , "Northern duck" , "Spotted dog < with clown" .)