Civilservice

3 clues
Sir Humphrey & Co?
Government administrators' group
What a polite tennis player is noted for?
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Activeservice
Airservice
Amidservice
Areservicemen
Armedservices
Armyservicebill
Beatyourservice
Beofservice
Blipservice
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Busservice
Carservice
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Civilservant
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Civilservice
Civilsuit
Civilsuits