Laugh at carefree jester encircled over here (4)
I believe the answer is:
jeer
'laugh at' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for jeer that I've seen before include "Boo" , "Catcall" , "Scoff, deride, mock" , "Mock publicly" , "Rudely mocking remark" .)