They may intercede between friends and countrymen (6)
I believe the answer is:
'countrymen' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for romans that I've seen before include "Empire builders" , "Ancient Italians" , "Citizens of Italian capital" , "Inhabitants of Italy's capital" , "'Friends, . . . . . ., countrymen, lend me your ears' (Julius Caesar)" .)