Exaggerated performance of car? Admits being misled (9)
I believe the answer is:
dramatics
'exaggerated performance' is the definition.
(dramatics can refer to over-dramatic behaviour)
'car? admits being misled' is the wordplay.
'being misled' indicates anagramming the letters (I've seen 'misleading' mean this (I've seen this in other clues)).
'car'+'admits'='caradmits'
'caradmits' anagrammed gives 'DRAMATICS'.
'of' is the link.
(Other definitions for dramatics that I've seen before include "(Eg amateur) stage productions" , "Theatrically emotional behaviour" .)