Circus performer's two-wheeled vehicle unknown in new site (9)

'circus performer's two-wheeled' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'vehicle unknown in new site' is the wordplay.
I cannot really understand how this works, but
'vehicle' could be 'trap' (trap is a kind of vehicle) and 'trap' is located in the answer.
'unknown' could be 'z' (algebra) and 'z' is found within the answer.
an anagram of 'site' is 'eist' which is within the left over letters.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?