Comical circus performer (5)
I believe the answer is:
clown
'comical circus performer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for clown that I've seen before include "Chap fooling around" , "Long-booted, bow tie-twirling circus entertainer" , "Act comically" , "Foolish chap" , "Red-nosed, long-shoed entertainer" .)