Don't touch German on his way around Germany (5,3)
I believe the answer is:
hands off
'don't touch' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'german on his way around germany' is the wordplay.
'german' becomes 'Hans' (common German name).
'on his way' becomes 'off' (I can't justify this - if you can you should give a lot more credence to this answer).
'around' means one lot of letters goes inside another.
'germany' becomes 'd' (vehicle registration code for Deutschland).
'hans'+'off'='hansoff'
'hansoff' going around 'd' is 'HANDS-OFF'.
Can you help me to learn more?
(Other definitions for hands off that I've seen before include "Don't touch!" , "Not getting involved" , "Don't interfere" , "Operated by remote control" .)