Those from Rome, perhaps, could make Nero pause (9)
I believe the answer is:
europeans
'those from rome perhaps' is the definition.
(Rome is in Europe)
'make nero pause' is the wordplay.
'make' indicates an anagram.
'nero'+'pause'='neropause'
'neropause' anagrammed gives 'EUROPEANS'.
'could' acts as a link.
(Other definitions for europeans that I've seen before include "Continentals" , "Irish and French people, say" , "The French and Italians, say" , "Frenchmen, Irishwomen, for instance" .)