Being stroppy, regularly avoided clowns here (3,3)
I believe the answer is:
big top
'avoided clowns here' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'being stroppy regularly' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'being'+'stroppy'='beingstroppy'
The alternating letters of 'beingstroppy' are 'BIG TOP'.
Can you help me to learn more?
(Other definitions for big top that I've seen before include "'Main circus tent (3,3)'" , "Circus venue" , "entertainment centre" , "needed by Mae West, for one?" , "performance in The Ring" .)