Days after a controversy erupted over a purported video of Guru Nanak Dev University's Vice-Chancellor Dr Karamjit Singh allegedly linking Guru Nanak Dev's philosophy with 'Vedanta' in the presence of RSS chief Mohan Bhagwat, the Akal Takht's officiating Jathedar has asked him to submit his clarification within 15 days after personally appearing before Sikh's temporal seat.