How to get money from cold grey vehicles across Germany? (4,5)

'how to get money' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'cold grey vehicles across germany?' is the wordplay.
I cannot really see how this works, but
'cold' could be 'c' (eg on taps) and 'c' is located in the answer.
'grey' could be 'ash' (ash grey is a kind of grey) and 'ash' is present in the answer.
'germany?' could be 'd' (international vehicle registration code) and 'd' is located in the answer.
'vehicles' could be 'cars' (car is a kind of vehicle) and 'cars' is located in the remaining letters.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).

'from' acts as a link.

Can you help me to learn more?