Lorry, one caught departing in cold (5)
I believe the answer is:
artic
'lorry' is the definition.
(articulated lorry is a semi-trailer truck)
'one caught departing in cold' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'caught' could be 'c' (cricket abbreviation) and 'c' is present in the answer.
The remaining letters 'art' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for artic that I've seen before include "rig" , "Large vehicle" , "Region around the North Pole" , "Large truck (informal)" , "This transports freight" .)