Yes, you can "fake" a payment using a clearing account, but NetSuite only allows Bill Payments from cash accounts. Potential options... (brainstorming)...
1. Use a Clearing Bank Account (if allowed)
• Create a Bank Type account called "Clearing Account."
• Pay the vendor bill using this account.
• Reverse the incorrect payment via a Journal Entry.
2. Reversing Journal Entries (if clearing account isn’t allowed)
• Create a vendor bill for the PO.
• Reverse the incorrect payment via Journal Entry (debit incorrect account, credit AP).
• Apply the JE to the vendor bill to mark it as paid.
3. Vendor Prepayment (alternative method)
• Create a vendor prepayment to a clearing account.
• Apply the prepayment to the vendor bill.
Best approach? If possible, use a clearing account in Bill Payment. I also like this option for audit trail tracking purposes. You could make it clear what the GL was created for then inactivate it after it's served its purpose. If restricted, go with a reversal JE.