Hit by a second lorry! (6)
I believe the answer is:
struck
'hit' is the definition.
(I've seen this before)
'by a second lorry' is the wordplay.
'by' says to put letters next to each other.
'a second' becomes 's' (common abbreviation).
'lorry' becomes 'truck' (I've seen this before).
's'+'truck' is 'STRUCK'.
(Other definitions for struck that I've seen before include "Hit - withheld labour" , "stopped working" , "Delivered a sharp blow" , "Thumped" , "hit hard" .)