Longman Dictionary of Contemporary English
public servant
noun
EXAMPLES FROM CORPUS
▪ Despite his eventual betrayal of me-for which I have forgiven him-Hu was a superb implementer and an outstanding public servant.
▪ She did not take her own advice, either as a ground-breaking lawmaker or later as an educator and volunteer public servant.
▪ Something of the concerned public servant had crept into his manner.
Wiktionary
public servant
n. 1 (context now historical English) Someone who labours for the public good; a convict assigned to work on public projects. (from 16th c.) 2 A person employed by the government; a civil servant. (from 17th c.)
WordNet
public servant
n. someone who holds a government position (either by election or appointment)