Car laid out is extreme (7)
I believe the answer is:
radical
'extreme' is the definition.
(I've seen this in another clue)
'car laid out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'car'+'laid'='carlaid'
'carlaid' anagrammed gives 'RADICAL'.
'is' is the link.
(Other definitions for radical that I've seen before include "Dial car in order to be drastic" , "One holding strong reformist views" , "Sweeping - reformer" , "Thoroughgoing - (popularly) extremist" , "Drastic and thorough, as reforms may be" .)