The main tent of a circus (3,3)
I believe the answer is:
big top
This clue might be a double definition.
'the main tent' is the first definition.
'big top' can be an answer for 'tent' (big top is a kind of tent). I'm unsure of the 'the main' bit.
'a circus' is the second definition.
(I've seen this in another clue)
'of' is the link.
Can you help me to learn more?
(Other definitions for big top that I've seen before include "entertainment centre" , "needed by Mae West, for one?" , "performance in The Ring" , "Circus venue" , "'Main circus tent (3,3)'" .)