Men are summoned to change handle (6)
I believe the answer is:
rename
'men are summoned' is the definition.
I can't tell whether this defines the answer.
'change handle' is the wordplay.
'change' becomes 're' (I can't justify this - if you can you should believe this answer much more).
'handle' becomes 'name' (I've seen this before).
're'+'name'='RENAME'
'to' is the link.
Can you help me to learn more?
(Other definitions for rename that I've seen before include "Confer new appellation of meaner sort" , "Call again" , "Alter title of" , "Brand again" , "Give a new title to" .)