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' (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" .)