Origin
This term was already in John Heywood’s 1546 proverb collection, was used figuratively by Shakespeare, and exists in many other languages as well.
Explanation
Someone who is new in a particular job will do a very good job at first, to prove how competent he or she is.People newly appointed to the positions of responsibility tend to make far-reaching changes. It is said that when someone new takes control of an organization, he makes many changes. New management will often make radical changes. It means that someone with a new perspective can make great changes.It suggests that a new leader will probably bring in his or her own cronies to replace the current sub-leaders. More extensively, a new leader of a corporation is likely to reevaluate entire business units amd possibly eliminate or sell off those that are underperforming. “A new broom sweeps clean” means that having new leadership, as in politics or business, will brush away old problems with a new approach. The saying might be used, for example, as a rationale for replacing an established politician with someone different in order to improve the situation in a city or state or country.
Examples
The new teacher immediately flunked three of the laziest students. “A new broom sweeps clean,” one of the students shrugged
Jill : That new supervisor is awfully strict.
Jane : New brooms sweep clean.
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