The correct answer is option 1, North Korea. North Korea is the country that has recently disclosed a clandestine nuclear weaponisation program.

Option 2, South Korea, is incorrect. South Korea is not the country that has disclosed a clandestine nuclear weaponisation program.

Option 3, Iran, is also incorrect. While Iran has been a focus of international concern regarding its nuclear program, as of now, there has been no recent disclosure of a clandestine nuclear weaponisation program by Iran.

Option 4, Indonesia, is also incorrect. Indonesia has not disclosed a clandestine nuclear weaponisation program.

In summary, the country that has recently disclosed a clandestine nuclear weaponisation program is North Korea, as stated in option 1.