Worried about vehicle keys (5)
I believe the answer is:
cared
'worried about' is the definition.
(I've seen this in another clue)
'vehicle keys' is the wordplay.
'vehicle' becomes 'car' (car is a kind of vehicle).
'keys' becomes 'ed' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'car'+'ed'='CARED'
Can you help me to learn more?
(Other definitions for cared that I've seen before include "Was concerned" , "Felt affection (for)" , "had feelings" , "Tended" , "Felt concern or interest" .)