Safety device for passenger feeling interest? (6)
I believe the answer is:
airbag
'safety device' is the definition.
(I've seen this before)
'passenger feeling interest?' is the wordplay.
'passenger feeling' becomes 'air' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'interest?' becomes 'bag' (I've seen this before).
'air'+'bag'='AIRBAG'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for airbag that I've seen before include "Protection" , "thing rarely subject to inflation" , "Rapidly-inflating car safety device" , "that's deployed to save a life" , "cushion" .)