It's set up at an all-round top speed (3,6)
I believe the answer is:
lap record
'it's set up at an all-round top speed' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'round top speed' is the wordplay.
'round' becomes 'lap' (as in a round or lap of a park).
'top speed' becomes 'record' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'lap'+'record'='LAP RECORD'
Can you help me to learn more?
(Another definition for lap record that I've seen is " Best all-round performance".)
