Investigation about cars here? (8)
I believe the answer is:
research
'investigation' is the definition.
(research is investigating something)
'about cars here?' is the wordplay.
'about' is an anagram indicator.
'cars'+'here'='carshere'
'carshere' with letters rearranged gives 'RESEARCH'.
(Other definitions for research that I've seen before include "material for investigation" , "Investigation designed to expand knowledge" , "Investigate through study" , "scientific survey" , "Experimentation" .)