Gas company known for its toy trucks (4)
I believe the answer is:
hess
'gas company known for its toy trucks' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hess that I've seen before include "leading Nazi" , "Rudolf ..., Nazi leader imprisoned at Spandau" , "Cite as evidence" , "Pianist Myra, Nazi Rudolf ---" , "Famous pianist" .)