See everybody gets the message (4)
I believe the answer is:
call
'the message' is the definition.
(call is a kind of message)
'see everybody' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'everybody' becomes 'all' (all people).
'c'+'all'='CALL'
'gets' is the link.
(Other definitions for call that I've seen before include "Entitle" , "Assign a name to" , "Be in control" , "Shout; ring" , "Summon, ring" .)