People from Tiber, perhaps (5)
I believe the answer is:
tribe
'people' is the definition.
(a tribe is a group of people)
'tiber perhaps' is the wordplay.
'perhaps' indicates an anagram.
'tiber' is an anagram of 'TRIBE'.
'from' is the link.
(Other definitions for tribe that I've seen before include "Breed" , "Ethnic group" , "Native group" , "Group related by blood or marriage" , "A set or class of people, may be primitive" .)