Petrol container in Panzer say (4)
I believe the answer is:
tank
This could be a double definition.
'petrol container' is the first definition.
'tank' can be an answer for 'container' (tank is a kind of container). I am unsure of the 'petrol' bit.
'panzer say' is the second definition.
(panzer is a kind of tank)
'in' is the link.
Can you help me to learn more?
(Other definitions for tank that I've seen before include "Possible alternative to barrel" , "Fighting vehicle" , "See 1 Across" , "Vat" , "Miltary vehicle" .)