Service breaks in general essentially all together (2,5)
I believe the answer is:
en masse
'all together' is the definition.
(I've seen this before)
'service breaks in general essentially' is the wordplay.
'service' becomes 'mass' (kind of church service).
'breaks in' is an insertion indicator (inserted letters break into the word).
'general essentially' becomes 'ene' (I am not sure about this - if you are sure you should believe this answer much more).
'mass' put inside 'ene' is 'EN MASSE'.
Can you help me to learn more?
(Other definitions for en masse that I've seen before include "as a bunch" , "All together - in France (2.5)" , "in concert" , "All together (Fr.)" , "In a group U altogether" .)