Silly berk surrounding us is a street entertainer (6)
I believe the answer is:
busker
'is a street entertainer' is the definition.
(I've seen this before)
'silly berk surrounding us' is the wordplay.
'silly' indicates anagramming the letters.
'surrounding' indicates putting letters inside.
'berk' is an anagram of 'bker'.
'bker' enclosing 'us' is 'BUSKER'.
(Other definitions for busker that I've seen before include "Street performer" , "player in street" , "Public entertainer" , "Street entertainer" , "Street musician" .)