Men of Wells, possibly (7)
I believe the answer is:
fellows
'men' is the definition.
(fellow is a kind of man)
'of wells possibly' is the wordplay.
'possibly' indicates an anagram.
'of'+'wells'='ofwells'
'ofwells' is an anagram of 'FELLOWS'.
(Other definitions for fellows that I've seen before include "Members of college" , "Chaps or associates" , "Companions" .)