Phones everybody in the Civil Service (5)
I believe the answer is:
calls
'phones' is the definition.
('call' can be a synonym of 'phone')
'everybody in the civil service' is the wordplay.
'everybody' becomes 'all' (I've seen this before).
'in the' means one lot of letters goes inside another.
'civil service' becomes 'cs'.
'all' placed within 'cs' is 'CALLS'.
(Other definitions for calls that I've seen before include "An Inspector - - (Priestley)" , "Brief visits" , "Speaks to attract someone's attention" , "Pays a visit" , "Shouts" .)