Gas brand with toy trucks (4)
I believe the answer is:
hess
'gas brand with 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 "Rudolf ..., Nazi leader imprisoned at Spandau" , "Cite as evidence" , "leading Nazi" , "Famous pianist" , "Pianist Myra, Nazi Rudolf ---" .)