To clear up

to explain; to dispel, as doubts, cares or fears.

See also: Clear

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
"Volunteers are heading out to clear up their area, speaking to others about the campaign and continuing to push the message that it is all our responsibilities to keep Renfrewshire clean.
Farmers often had to clear up at their own expense to safeguard livestock.
As Mr Williams' farm is surrounded by country lanes, over the years he's been forced to clear up tonnes of rubbish: concrete blocks, bikes, clothes, black bin liners, bottles, newspapers and carpets.