Discover it's how a dog likes to travel in a car (4,3)
I believe the answer is:
nose out
'discover' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for nose out that I've seen before include "Discover" , "Emerge cautiously" , "how to subtly get in the way?" .)