Venerable Roman emperor ignores us (6)
I believe the answer is:
august
'venerable' is the definition.
(synonyms)
'roman emperor ignores us' is the wordplay.
I cannot quite see how this works, but
'us' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for august that I've seen before include "Revered" , "Gregorian calendar month" , "Roman emperor's month" , "Month named after a Roman emperor" , "Pale-faced fool" .)