Cry about everything (4)
I believe the answer is:
call
'cry' is the definition.
(I know that cry can be written as call)
'about everything' is the wordplay.
'about' becomes 'c' (abbreviation for circa).
'everything' becomes 'all' (all things).
'c'+'all'='CALL'
(Other definitions for call that I've seen before include "Visit; shout" , "Hail; visit" , "Summon; shout" , "Name; visit" , "Cry - summon" .)