Emperor on the way to one part of Rome (4)
I believe the answer is:
nero
'emperor' is the definition.
(Roman emperor)
'the way to one part of rome' is the wordplay.
I cannot really see how this works, but
'way' could be 'r' (abbreviation for right) and 'r' is found in the answer.
an anagram of 'one' is 'neo' which is present in the left over letters.
No letters remain.
This explanation may well be incorrect...
'on' acts as a link.
Can you help me to learn more?
(Other definitions for nero that I've seen before include "Emperor said to have started the fire that destroyed Rome" , "Tyrannical Roman emperor" , "Ancient Roman emperor" , "Roman emperor, d. AD68" , "Roman tyrant" .)