Transport for magistrate going round central Greece (4)
I believe the answer is:
jeep
'transport' is the definition.
(jeep is a kind of transport)
'magistrate going round central greece' is the wordplay.
'magistrate' becomes 'jp'.
'going round' means one lot of letters goes inside another.
'central' says to take the centre.
The centre of 'greece' is 'ee'.
'jp' placed around 'ee' is 'JEEP'.
'for' is the link.
(Other definitions for jeep that I've seen before include "Vehicle for rough terrain" , "Sturdy vehicle" , "Small four-wheel drive vehicle" , "4WD vehicle" , "Army vehicle, 4-wheel drive" .)