Fifth vehicle in queue perhaps is giving concern (4)

I believe the answer is:
care
'concern' is the definition.
(synonyms)
'fifth vehicle in queue perhaps is' is the wordplay.
I cannot really see how this works, but
'vehicle' could be 'car' (car is a kind of vehicle) and 'car' is located in the answer.
A single letter 'e' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
'giving' acts as a link.
Can you help me to learn more?
(Other definitions for care that I've seen before include "Protective custody" , "Attention - caution U protection" , "Be concerned or nurse" , "Have concern or regard" , "Serious attention and thought" .)
