Cash clearing can actually serve multiple purposes. So the advice already given covers that - track the past entries in the account to see what it was for.
Why not post direct to the bank? If you use the concept that Rita was referring to, you can post any amount received from customers and take what they owe off the A/R Aging reports. Then you will not try to collect on them. The Cash Clearing account is holding the money until you actually go to the bank. When you go to the bank you post one general journal entry from the Cash Clearing account (credit) and into the Bank account (Debit). This way your bank ledger will have one number for the deposit on the actual day you made the deposit.
If you posted every single cheque received directly to the bank account all week and went to the bank on Friday. Your bank deposit may be made up of 15 entries for the week. When you try to do the bank rec, you have to review your deposit book a full second time, doubling the work in order to compare the bank statement with your books in Simply. Comparing one number on the ledger with the one number on the statement is a lot easier.