Visits everyone in Civil Service (5)
I believe the answer is:
calls
'visits' is the definition.
('call' can be a synonym of 'visit')
'everyone in civil service' is the wordplay.
'everyone' becomes 'all' (all people).
'in' indicates putting letters inside.
'civil service' becomes 'CS' (abbreviation).
'all' going inside 'cs' is 'CALLS'.
(Other definitions for calls that I've seen before include "Summons" , "Makes a social visit" , "An Inspector - - (Priestley)" , "Visits; rings" , "Names" .)