Shares of Norwell-based Clean Harbors jumped as investors ­apparently liked the $1.25 billion cash deal for oil recycler Safety Kleen Inc. disclosed by the environmental services company on Monday. Analysts said that Safety-Kleen, of Plano, Texas, would secure for Clean Harbors the number one spot in the oil recycling business and give it a foothold in the business of hauling away hazardous waste for small businesses.