Frightened journalist following small vehicle (6)
I believe the answer is:
scared
'frightened' is the definition.
(scared means frightened or fearful)
'journalist following small vehicle' is the wordplay.
'journalist' becomes 'ed' (short for editor).
'following' is a charade indicator (letters next to each other).
'small' becomes 's' (abbreviation - e.g. clothes size).
'vehicle' becomes 'car' (car is a kind of vehicle).
's'+'car'='scar'
'ed' put after 'scar' is 'SCARED'.
(Other definitions for scared that I've seen before include "Frightened or intimidated" , "Thing which precipitates an event" , "Frightened, alarmed" , "Frightened or apprehensive" , "Nervous" .)