Verbally, one suddenly attacking country (6)
I believe the answer is:
russia
'country' is the definition.
(Russia is a country)
'verbally one suddenly attacking' is the wordplay.
'verbally' shows a homophone (sound like).
'one suddenly attacking' becomes 'rusher' (rush can mean to attack suddenly).
'rusher' sounds like 'RUSSIA'.
(Other definitions for russia that I've seen before include "Putin's country" , "Eastern European state" , "Find US sari strangely in this country" , "James Bond novel and film: 'From . . . . . . with Love'" , "Large country" .)