Travelling show (6)
'travelling show' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for circus that I've seen before include "Open space where streets meet" , "Travelling tent show" , "lively scene" , "Carnival" , "Trvelling company of entertainers, usually with animals" .)
(Other definitions for funfair that I've seen before include "Amusements here" , "Swings and roundabouts" , "entertainment for the family?" , "place of amusement" , "Amusement park" .)