Phone about everyone (4)
I believe the answer is:
call
'phone' is the definition.
(I've seen this before)
'about everyone' is the wordplay.
'about' becomes 'c' (abbreviation for 'circa').
'everyone' becomes 'all' (I've seen this before).
'c'+'all'='CALL'
(Other definitions for call that I've seen before include "Ring; name" , "Visit; telephone" , "Assign a name to" , "Visit; cry out" , "Visit; shout" .)