Alarming means of transport in the outskirts of Surrey (5)
I believe the answer is:
scary
'alarming' is the definition.
(similar in meaning)
'means of transport in the outskirts of surrey' is the wordplay.
'means of transport' becomes 'car' (I've seen this before).
'in the' indicates putting letters inside.
'outskirts of' means to remove the middle letters (only letters on the outskirts).
'surrey' with its middle taken out is 'sy'.
'car' going inside 'sy' is 'SCARY'.
(Other definitions for scary that I've seen before include "Alarming, maybe paranormal" , "Frightening or spooky" , "Hair-raising" , "Fearsome" , "spook" .)