Maximum speed of prat: ego out of control (3,4)
I believe the answer is:
top gear
'maximum 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.
'prat ego out of control' is the wordplay.
'out of control' is an anagram indicator.
'prat'+'ego'='pratego'
'pratego' with letters rearranged gives 'TOP GEAR'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for top gear that I've seen before include "one may drive in it" , "Portage (anag) - TV motor programme" , "Fifth - motoring programme" , "Perhaps fourth" , "TV car programme" .)