Lorry stuck in traffic, I travelled in the opposite direction (5)
I believe the answer is:
artic
'lorry' is the definition.
(articulated lorry is a semi-trailer truck)
'stuck in traffic i travelled in the opposite direction' is the wordplay.
'stuck in' indicates the answer is hidden within the clue.
'in the opposite direction' says the letters should be written in reverse.
'citra' is hidden within 'traffic i travelled'.
'citra' back-to-front is 'ARTIC'.
(Other definitions for artic that I've seen before include "Heavy transporter" , "Manoeuvrable lorry" , "rig" , "Polar region" , "Large vehicle" .)