Govt clearance not required. Only regulation is that a private dth or satellite communication company in India can hire a TP from foreign satellites only through isro. Reliance TPs are already leased from measat through isro only. There won't be much difficulty for Sundirect to take those 4 TPs.
Those TPs ill be available in less amount for Sundirect considering that :
1. Reliance was not making the payment for the last few financial quarters. Whatever amount now Sundirect offers is a gain for satellite operator.
2. Sundirect is a loyal customer of Measat from 2010 onwards.
3. The TPs are already allocated for Indian subcontinent. Finding another leaser won't be happening quick. Realigning the beam yo allocate the TP to another geographic area will be an expensive operation for measat.