Very little car sickness (7)
I believe the answer is:
minimal
'very little' is the definition.
(I've seen this before)
'car sickness' is the wordplay.
'car' becomes 'mini' (Mini Cooper).
'sickness' becomes 'mal' (I've seen this before**).
'mini'+'mal'='MINIMAL'
(Other definitions for minimal that I've seen before include "Very small, the least possible (7)" , "Of the least possible size" , "barely worth considering" , "Token" , "Least possible; negligible" .)