During her visit to India, Secretary of State Clinton also announced that Prime Minister Singh will make the first state visit under Obama.
The process will be closely watched by the US and other foreign governments for signs of Pakistan's ability to deal with the Taliban.
Qari Zainuddin, who had been challenging militant chief and fellow tribesman Baitullah Mehsud, was shot dead Tuesday.
As the Army begins attacking South Waziristan, it has targeted hideouts of Baitullah Mehsud. Killing or even dislodging the militant chief could deal a severe blow to the movement, analysts say.
As many as 50 died Saturday as the military prepares to officially launch an offensive in the Taliban stronghold.