Meaning: an irresistible victory. Easy success.

Example:
1.-The forecasters are predicting of making a clean sweep for the ruling party in the approaching election.
2.-In Year 2014 Mr. Narendra Modi made a clean sweep the Congress Party and became the Prime Minister.

Meaning: confess completely.

Example:
While wedged stealing in Super Market, Robert Daniel decided to make a clean breast of it to the owner of the store.

Meaning: to make a disclosure. To confess everything that there is to confess.

Example:
1.-The guy came clean after the police had started their investigation about the robbery.
2.-I have to come clean about this incident else my conscious will kill me anyway.

Meaning: continuously or interrupted. Lasting through the day.

Example:
1.-The counselor has been working round the clock with patients. His dedication has been acknowledged by the hospital through this award.
2.-The prisoners are monitored round the clock by the officers. There is no way to escape.