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As an Islamic financing structure, the seller is the lender, typically selling something the borrowing person or company needs for their business. The buyer/borrower pays in periodic installments, and at a higher price than the seller/lender paid for the item(s), but with a profit margin agreed on by both parties.
Casbah or Kasbah - Hebrew. Kasbah: Old market-place roofed by arches in an Arab town. The song is refering to political terms of two cultures fighting against each other - the casbah is the place that was rocked by these cultures and their 'clash' with each other along with their bombs.